Light Guidelines for Museum Display Cases from Wangda Showcases Limited

Light Guidelines for Museum Display Cases

What Are the Concerns Regarding Light for Museum Display Cases?

Of all the hazards to which items on display are subjected, exposure to light is probably the most serious in the majority of situations. Fortunately, this is a problem that you can control, often with little effort and no money. For example, turning the lights off when no one is in the display area is easy to do, costs nothing, and actually saves money.

Light damages most of the materials from which cultural items are made.
The most obvious damage is the fading of dyes, pigments, and manuscript inks. Less noticeable but equally serious is the degradation of materials, especially textiles, paper, fibers, and feathers, which is greatly accelerated by light exposure.
Any exposure to light, even for a brief time, is damaging, and the damage cannot be reversed. For this reason, exposure to light should be limited, and most items should not be displayed permanently. Display should be for the shortest possible time and at the lowest reasonable light levels. Note that some lights, such as incandescent bulbs, generate heat and should be kept at a distance from
displayed items and out of exhibit cases. Also, items should not be displayed where the sun shines directly on them, even if for only a short time and even if the windows through which the sun shines are covered with an ultraviolet-filtering plastic.

What Are Acceptable Light Levels?

Light levels are measured in two different types of units: lux and footcandles (one footcandle equals approximately 11 lux). For many years, generally accepted recommendations limited light levels for very sensitive materials to no more than 50 lux, and for moderately sensitive materials to 150 to 250 lux, although opinions on these levels varied. In recent years these recommendations have been debated, taking into consideration aesthetic concerns and varying rates of light fading for different materials. Also, it has been recognized that older viewers need higher light levels to discern details than do younger viewers. Ultraviolet (UV) light causes damage more quickly, and all light sources should be filtered to remove UV. This light is measured in units called microwatts per lumen. In general, if a light source emits more than 10 microwatts per lumen, it requires a filter.

Suggested Light Levels

The following guidelines serve as a general rule for items that are on display. There are, however, exceptions. Also, opinion varies regarding appropriate light levels for different materials. Consult a preservation professional if you have any questions.

Materials that are very sensitive to light include textiles, paper, dyed quills, fibers, feathers, fur, and most dyes, pigments, and manuscript inks.Suggested maximum light level for these materials is 50 lux. These materials are found in such items as garments, baskets, drawings, documents, bags, and most everything that has color applied to it.

Materials that are moderately sensitive to light include wood, parchment,leather, bone, ivory, horn, and oil paintings.Suggested maximum light level for these materials is 150–250 lux.These materials are found in such items as utensils, drums, decorations, bookbindings, and some weapons.


Materials that are generally nonsensitive to light include unpainted ceramics, glass, metal, and stone.Usually these materials do not have a suggested maximum light level unless they have a light-sensitive material added to them.These materials are found in such items as utensils, bowls, vessels, and spear points.Suggested maximum ultraviolet (UV) light level for all materials is 10 microwatts per lumen.All exposure to light is damaging for most materials. Staying within these light levels will slow the damage but will not prevent it.

For How Long Should Items Be Displayed?

Even if items are displayed at acceptable light levels, fading, embrittlement, and deterioration will eventually occur if items are displayed for too long. How do you know when this will happen? This is difficult, if not impossible, to determine in advance, so you will need to consider all the relevant factors and make a judgment. Every museum must decide for itself what the maximum display times and total light exposure limits should be for its items based on several factors.


How Do You Decide on Limits?

Factors to consider include the amount of time that lights are turned on in the display area, the light levels in the display area, the light sensitivity of the materials in the item being displayed (calculations should be based on the most sensitive material in an item, not the least), the physical condition of the item, an item’s history of prior display, the desired lifespan of the item, the significance of aesthetic concerns (the importance of seeing details, which requires higher light levels), and the audience (an older audience requires higher light levels to see items well). Begin your consideration by looking at the items you have on display at present. See if you can identify any fading that may already have occurred by turning them over to determine if they are darker or brighter where not exposed to light. Note that the amount of light shining on one item in a display area will not necessarily be the same for other items in the display area. The amount of light on each item should be measured, and the position of the items on display adjusted accordingly.


What Are Lux Hours?

Some museums track total light exposure in terms of lux hours, which take into account both the intensity of exposure and the number of hours of exposure. The number of lux hours is obtained by multiplying the light levels (in lux) of the light shining on an item by the number of hours the item is exposed to this level of light.

The more intense or bright the light, the shorter the display times should be. Limited exposure to a high-intensity light will produce the same amount of damage as long exposure to a low-intensity light. For example, if the exposure time is kept the same but the intensity of illumination—the light level—is halved, the resulting damage will be halved (100 lux 50 hours = 5000 lux hours, whereas 50 lux 50 hours = 2500 lux hours). This relationship, referred to as the law of reciprocity, is helpful in deciding on light levels and the length of display time. Some museums have settled on an annual light exposures ranging from150,000 lux hours for very sensitive materials to 450,000 lux hours.


How Do You Measure Light Levels?

The easiest and most accurate way to measure light levels is with a light meter. Note that not all meters measure UV, and you will want to obtain one that does if possible. Light meters are expensive, ranging from several hundred to several thousand dollars, and not many museums have them. The ones that do will sometimes loan them by mail. Also, some regional conservation centers have light meters available for loan by mail. If you cannot obtain a light meter, you can measure non-UV light using a 35mm single-lens reflex camera with a built-in light meter. For instructions on how to do this contact a preservation professional.

Two inexpensive tools are available that will enable you to estimate the possible damage that could occur in your display area. One is a Blue Wool standards card available from conservation suppliers. These cards can be cut into vertical strips to increase the number of them for use. Cover half of the card lengthwise with a light-blocking material, and then place it in a display case or in the display area. Periodically remove the light-blocking material and compare the two halves of the card to see the amount of fading that has resulted from the light. This will give you a general indication of how serious your light exposure problem is.

How Can You Minimize Light Damage to an Item?

Decide on an acceptable exposure time and light level for an item, and do not exceed them. If you have reached the limits for a particular item, one solution practiced in many museums is to take that one item off display and replace it with another. This practice of rotation is a commonly employed strategy for limiting the damage to an item while maintaining the integrity of the display. It requires, however, that other similar items suitable for the display are available and that staff have the time to carry out the rotation (selection and preparation of the replacement item, modification of display label text, removal and cleaning of the rotated item, record keeping to track this change). Rotation works best when exposure histories in lux hours are kept for each item so you know when to rotate one item on display with another. These histories are referred to as lux logs by some museums.

Another method of minimizing light damage is to illuminate an item on display only when a visitor comes to see it. Lights can be controlled by motion sensors to go on when the visitor’s presence triggers the sensors. Alternatively, the visitor can push a button to activate a light when he or she wants to see the item. The simplest and least expensive way to minimize light damage is to cover display cases with a light-blocking cloth that the visitor lifts when he or she wants to view items in the case.

Finally, camera flashes are no longer considered a light problem unless you expect specific items on display to be photographed frequently, in which case you may want to prohibit flash photography. Extended use of photographic or video lighting can cause damage, so you may want to restrict this, explaining to visitors that this restriction is due to the light sensitivity of the items.

Temperature and Relative Humidity in Museum Display Cases from Wangda Showcases Limited

Maintaining acceptable levels of temperature and relative humidity in mueum display cases is very important. This will help slow the rate of deterioration for the items on display just as it does for those in storage. The guidelines provided in Basic Preservation Considerations should be followed in determining acceptable levels.


What Are Macro- and Micro-environments?

Acceptable levels of temperature and relative humidity are controlled within a macro-environment, a micro-environment, or a combination of both. The definitions of these terms seem to vary within standard museum preservation practice. In general, the term macro-environment refers to the conditions within a large space, such as the entire display area, whereas micro-environment refers to the isolated conditions within a smaller enclosed space, such as a display case.


What Are Active and Passive Systems?

The conditions in the macro- or micro-environment can be achieved by what preservation professionals refer to as an active or a passive system. These definitions also vary in the preservation field. As the terms are used here, active systems usually employ equipment such as furnaces, boilers, air conditioners, dehumidifiers, and humidifiers. Passive systems, on the other hand, usually rely on the natural buffering capacity of materials such as paper, cloth, wood, and silica gel.


How Are Conditions Maintained?

In practice, a combination of macro- and micro-environments and active and passive systems is often utilized to maintain acceptable conditions. The temperature and relative humidity of the entire display area—the macro-


environment—are maintained by the building-wide heating and air conditioning equipment—an active system. For highly sensitive materials, such as metals that corrode in high humidity or wood that shrinks in low humidity, a humidity- buffering material such as silica gel—a passive system—is used in a display case—a micro-environment—to adjust conditions and maintain them at the special levels needed by especially sensitive materials.
If you expect to loan items to a museum in another geographic area where the conditions are very different from those to which your items are acclimated, you may need to use a microenvironment with a passive system. The same is true when borrowing items that you need to protect while they are in your care. Do not hesitate to consult a preservation professional for guidance in this.


Monitoring

The temperature and relative humidity in the display area should be monitored just as in the storage area. The instruments described in Basic Preservation Considerations can be used. Some of these are available in small sizes that work well in display cases.

Custom-made / Bespoke Display Case from Wangda Showcases Limited

Special museum display cases can be custom-made on request according to special exhibits or special exhibition.Immense size,abnormal shape like column,trapezoid shape or particular function like zero oxygen environment of museum display cases can all be customized.No any compromise on the security,stability and airtightness come to special display cases. Glass Panels--- For special museum display cases,the glass panels are still made by 3-ply laminated safety glass which meets BS EN356 Part 4A,the international authoritative criteria of safety glass.Optiwhite glass with low iron content or ultra clear glass with low reflective coat ensures high light transmittance with no vision distortion.Frameless construction and invisible glass bonding bring no any sight obstruction on display.UV bonding adhesive under advanced UV bonding technology and dedicated cure agent make glass hood elegant but solid.Specifications of glass like 4+0.76+4,5+0.76+5,4+1.52+4,5+1.52+5 is usually proposed or 6+1.52+6 or 8+1.52+8 for larger sizes of display cases.. Construction Support--- Same as standard museum display cases,the metal profile of modular display cases to receive glass panels is still made by dedicated powder-coated aluminum extrusions and then tightly secured to structural steel skeleton that is made by mild/low carbon steel and powder-coated for finish. Inner Invironment--- As inert materials are comprehensively applied for making special museum display cases,no any chemical reaction will take place inside internal environment.All the adhesive,sealant and cure agent for bonding are completely neutral and non-hazardous,and that ZF-MDF for structural backboard and dressing baseboard are fully sealed by aluminized polyethylene film then veneered with environmental fabric,so internally,no destructive pollutional VOCs will bring any damage on displayed exhibits including sensitive artifacts. Shelving System--- For custom-made special museum display cases,there are usually 2 shelving systems for options,i.e.fabric-dressed ZF-MDF baseboards or powder-coated steel decks to work as shelving platform,or come with a pending glass shelving system with tempered/toughened glass shelves.For glass shelving system,the glass shevles are movable so as to freely adjust the shelving height.

Opening Solution--- Swing opening to achieve max. 90° access through dedicated hinge mechanism or pull and slide opening solution through the sliding mechanism are also usually proposed to use for special design of museum display cases. Air Tightness--- For special construction display cases,airtightness still keeps minimal same as standard museum display cases.Consistency of structure by dedicated extrusions,precise fabrication on glass and metal parts work together with seal extrusion,seal sealant and silicon seal strip to create a well airtightness at a minimal air exchange rate not more than 0.2 every 24 hours,consequently,a dust-proof internal display space is created. Microclimate Control--- To reach a relatively constant humidity and temperature for perfect conservation on displayed exhibits,special museum display cases can be discretely and invisibly equipped with passive microclimate control systems under baseboards or much more precision of electronic active microclimate units. Lighting System--- Lighting system for special tailored museum display cases should be always protective and far from heat accumulation and UV or IR radiation so LED bar or fibre optic lighting system is usually proposed.to achieve Fiber optic lighting systems have extremely low heat and UV output so will not damage delicate items prone to degradation by light and can ideally create theatric display effect by combination of different end light fittings and dimmable light level Lock System--- As the lock system with the highest level of security,Abloy cam locks or push locks can excellently and perfectly resist any physical attacks so as to loyally safeguard the access of museum display cases so the integral security of museum display cases is enhanced

Modular Display Cases from Wangda Showcases

Specially tailored to meet travelling exhibition or the exhibition that need to change exhibits frequently,modular museum display cases can serve as an individual display system and also can be combined together from four directions to change into new structure shape of display cases so as to get larger and special-shape display space.No any compromise on the security,stability and airtightness come to this design. Glass Panels--- For modular museum display cases,the glass panels are still made by 3-ply laminated safety glass which meets BS EN356 Part 4A,the international authoritative criteria of safety glass.Optiwhite glass with low iron content or ultra clear glass with low reflective coat ensures high light transmittance with no vision distortion.Frameless construction and invisible glass bonding bring no any sight obstruction on display.UV bonding adhesive under advanced UV bonding technology and dedicated cure agent make glass hood elegant but solid.Specifications of glass like 4+0.76+4,5+0.76+5,4+1.52+4,5+1.52+5 is usually proposed. Construction Support--- Same as standard museum display cases,the metal profile of modular display cases to receive glass panels is still made by dedicated powder-coated aluminum extrusions and then tightly secured to lower steel structure that is made of mild/low carbon steel in powder-coating finish. Inner Invironment--- As inert materials are comprehensively applied for making modular museum display cases,no any chemical reaction will take place inside internal environment.All the adhesive,sealant and cure agent for bonding are completely neutral and non-hazardous,and that powder-coated steel baseboard or ZF-MDF for dressing baseboard is fully sealed by aluminized polyethylene film then veneered with environmental fabric,so internally,no destructive pollutional VOCs will bring any damage on displayed exhibits including sensitive artifacts. Shelving System--- For modular display display cases,there are usually 2 shelving systems for options,i.e.fabric-dressed ZF-MDF baseboards or powder-coated steel decks to work as shelving platform,or come with a pending glass shelving system with tempered/toughened glass shelves.For glass shelving system,the glass shevles are movable so as to freely adjust the shelving height.

Opening Solution--- Swing opening to achieve more than 90° access through dedicated hinge mechanism is usual for modular museum display cases.Pull and slide opening solution through the sliding mechanism can also be applied for this design. Air Tightness--- No any compromise on airtightness for modular museum display cases.Consistency of structure by dedicated extrusions,precise fabrication on glass and metal parts work together with seal extrusion,seal sealant and silicon seal strip to create a well airtightness at a minimal air exchange rate not more than 0.2 every 24 hours,consequently,a dust-proof internal display space is created. Microclimate Control--- To reach a relatively constant humidity and temperature for perfect conservation on displayed exhibits,modular museum display cases can also be discretely and invisibly equipped with passive microclimate control systems under baseboards. Lighting System--- Lighting system for modular museum display cases should be always protective and far from heat accumulation and UV or IR radiation so LED bar or fibre optic lighting system is usually proposed. Lock System--- As the lock system with the highest level of security,Abloy cam locks or push locks can excellently and perfectly resist any physical attacks so as to loyally safeguard the access of museum display cases so the integral security of museum display cases is enhanced

Drawer Table Case / Cabinet Case from Wangda Showcases Limited

Museum table display case of drawer design/display cabinet is a combination of standard table display cases and drawer units.A full-vision glass hood with glazed panels for all sides supplies all direction display and lower drawer units with clear glass top supplies perfect storage and high density display.The combination is applicable to the batch exhibition of small,thin and flat artifacts such as jewelry,documents,coins,medals,manuscript,calligraphy and so on. Glass Panels--- Glass hood for museum display cases of table design is made by 3-ply laminated safety glass which meets BS EN356 Part 4A,the international authoritative criteria of safety glass.Optiwhite glass with low iron content or ultra clear glass with low reflective coat ensures high light transmittance with no vision distortion.All glass frameless construction and invisible glass bonding bring no any sight obstruction on display.UV bonding adhesive under advanced UV bonding technology and dedicated cure agent make glass hood and drawer cases elegant but solid.Specifications of glass like 4+0.76+4,5+0.76+5,4+1.52+4,5+1.52+5 for usual option. Construction Support--- For museum display cases of table design,the metal profile to receive glass panels is made by dedicated powder-coated aluminum extrusions and then is tightly secured to lower steel structure.Lower steel table structure to support upper part is made of mild/low carbon steel in powder-coating finish.Each drawer unit is mounted on the dedicated heavy-duty sliding system.Levelling adjusters and master rollers at the feet get table display case more convenient and practical. Inner Invironment--- As inert materials are comprehensively applied for making museum display cases of table design,no any chemical reaction will take place inside internal environment of cases.All the adhesive,sealant and cure agent for bonding are completely neutral and non-hazardous,and that ZF-MDF panel for dressing baseboard is fully sealed by aluminized polyethylene film then veneered with environmental fabric,so internally,no destructive pollutional VOCs will bring any damage on displayed exhibits including sensitive artifacts. Shelving System--- For table display cases with drawer or storage cabinets, usually fabric-dressed ZF-MDF baseboards work as shelving platform.

Opening Solution--- Opening solution for glass hood is swing opening for partial access and pull & push opening for individual drawer units.For easy and secure operation,swing opening is usually additionally supported by 2 gas strut from sides.For easy operation,each drawer can fix a handle. Air Tightness--- Consistency of structure by dedicated extrusions,precise fabrication on glass and metal parts work together with seal extrusion,seal sealant and silicon seal strip to create a well airtightness at a minimal air exchange rate not more than 0.2 every 24 hours,consequently,a dust-proof internal display space is created. Microclimate Control--- To reach a relatively constant humidity and temperature for perfect conservation on displayed exhibits,museum table display cases of drawer design are discretely and invisibly equipped with passive microclimate control systems.Passive microclimate control system is usually realized by silicon gel/artsorb/prosorb inside the dedicated metal tray under baseboards. Lighting System--- Lighting system for museum display cases of table design should be always protective and far from heat accumulation and UV or IR radiation so LED bar or fibre optic lighting system is usually proposed.For some special illumination in glass hood,particular lighting system like swan neck lighting devices can be bespoke on request.Fiber optic lighting systems have extremely low heat and UV output so will not damage delicate items prone to degradation by light and can ideally create theatric display effect by combination of different end light fittings and dimmable light level. Lock System--- As the lock system with the highest level of security,Abloy cam locks or push locks can excellently and perfectly resist any physical attacks so as to loyally safeguard the access of glass hood and individual drawer unit so the integral security of museum display cases is enhanced

Bevel Desk Display Cases from Wangda Showcases

Bevel / tilt museum table display case come with a slope glass hood.The slope glass hood is seated on an open or closed plinth.Frameless glass hood with glass and solid panels supplies a transparent,front & top viewed and protective showcasing environment.It is applicable to the exhibition of small,medium and flat artifacts such as coins,medals,manuscript,calligraphy and so on. Glass Panels--- Glass hood for museum display cases of table design is made by 3-ply laminated safety glass which meets BS EN356 Part 4A,the international authoritative criteria of safety glass.Optiwhite glass with low iron content or ultra clear glass with low reflective coat ensures high light transmittance with no vision distortion.Frameless construction and invisible glass bonding bring no any sight obstruction on display.UV bonding adhesive under advanced UV bonding technology and dedicated cure agent make glass hood elegant but solid.Specifications of glass like 4+0.76+4,5+0.76+5,4+1.52+4,5+1.52+5 is usually proposed. Construction Support--- For this museum display case of table design,the metal profile to receive glass panels is made by dedicated powder-coated aluminum extrusions and then is tightly secured to lower steel structure.Solid 25mm thick ZF-MDF and 2mm thick steel panels are used as structural backboard even side boards.Lower steel table structure to support upper part is made of mild/low carbon steel in powder-coating finish.The usual design of table support can be 2 x steel cheek plates or or closed and lockable plinth.Levelling adjusters and master rollers at the feet get table display case more convenient and practical. Inner Invironment--- As inert materials are comprehensively applied for making museum display cases of table design,no any chemical reaction will take place inside internal environment.All the adhesive,sealant and cure agent for bonding are completely neutral and non-hazardous,and that ZF-MDF for dressing baseboard,structural backboard even side boards are fully sealed by aluminized polyethylene film then veneered with environmental fabric,so internally,no destructive pollutional VOCs will bring any damage on displayed exhibits including sensitive artifacts. Shelving System--- For tabletop bevel museum display cases, usually fabric-dressed ZF-MDF baseboards or powder-coated steel decks work as shelving platform.

Opening Solution--- As needed by actual exhibits and exhibition,opening solution can be specified as swing opening for partial access or elevating opening for full access.For easy and secure operation,swing opening is usually additionally supported by 2 gas strut from sides and elevating opening is electrically driven.For larger table display cases,remote control opening can be optionally configurated. Air Tightness--- Consistency of structure by dedicated extrusions,precise fabrication on glass and metal parts work together with seal extrusion,seal sealant and silicon seal strip to create a well airtightness at a minimal air exchange rate not more than 0.2 every 24 hours,consequently,a dust-proof internal display space is created. Microclimate Control--- To reach a relatively constant humidity and temperature for perfect conservation on displayed exhibits,museum display cases of table design are discretely and invisibly equipped with passive or active microclimate control systems.Passive microclimate control system is usually realized by silicon gel/artsorb/prosorb inside the dedicated metal tray under baseboards.Electronic active microclimate control system inside lower chamber can realize more precise control on desired humidity and temperature in museum display cases. Lighting System--- Lighting system for museum display cases of table design should be always protective and far from heat accumulation and UV or IR radiation so LED bar or fibre optic lighting system is usually proposed.For some special illumination,particular lighting system like swan neck lighting devices can be bespoke on request.Fiber optic lighting systems have extremely low heat and UV output so will not damage delicate items prone to degradation by light and can ideally create theatric display effect by combination of different end light fittings and dimmable light level. Lock System--- As the lock system with the highest security level,Abloy cam locks or push locks can excellently and perfectly resist any physical attacks so as to loyally safeguard the access of museum display cases so the integral security of museum display cases is enhanced.

All Glass Hood Tabletop Display Cases from Wangda Showcases

All-glass hood tabletop display cases comes in a full-vision glass hood that is seated on a stable steel table structure.Frameless glass hood with glazed panels for all exposed sides and security construction to supply a transparent,fully-viewed and protective showcasing environment.The simplicity style of table display case is applicable to the exhibition of small,flat,narrow and long artifacts such as documents,coins,medals,manuscript,calligraphy and so on. Glass Panels--- Glass hood for museum display cases of table design is made by 3-ply laminated safety glass which meets BS EN356 Part 4A,the international authoritative criteria of safety glass.Optiwhite glass with low iron content or ultra clear glass with low reflective coat ensures high light transmittance with no vision distortion.All glass frameless construction and invisible glass bonding bring no any sight obstruction on display.UV bonding adhesive under advanced UV bonding technology and dedicated cure agent make glass hood elegant but solid.Specifications of glass like 4+0.76+4,5+0.76+5,4+1.52+4,5+1.52+5 for usual option. Construction Support--- For museum display cases of table design,the metal profile to receive glass panels is made by dedicated powder-coated aluminum extrusions and then is tightly secured to lower steel structure.Lower steel table structure to support upper part is made of mild/low carbon steel in powder-coating finish.The usual design of table support can be 2 x steel cheek plates or 4x square steel legs or closed and lockable chamber.Levelling adjusters and master rollers at the feet get table display case more convenient and practical. Inner Invironment--- As inert materials are comprehensively applied for making museum display cases of table design,no any chemical reaction will take place inside internal environment.All the adhesive,sealant and cure agent for bonding are completely neutral and non-hazardous,and that ZF-MDF baseboard panel is fully sealed by aluminized polyethylene film then veneered with environmental fabric,so internally,no destructive pollutional VOCs will bring any damage on displayed exhibits including sensitive artifacts. Shelving System--- For tabletop museum display cases, usually fabric-dressed ZF-MDF baseboards or powder-coated steel decks work as shelving platform.

Opeing Solution---  As needed by actual exhibits and exhibition,opening solution can be specified as swing opening for partial access or elevating opening for full access.For easy and secure operation,swing opening is usually additionally supported by 2 gas strut from sides and elevating opening is electrically driven.For larger table display cases,remote control opening can be optionally configurated. Air Tightness--- Consistency of structure by dedicated extrusions,precise fabrication on glass and metal parts work together with seal extrusion,seal sealant and silicon seal strip to create a well airtightness at a minimal air exchange rate not more than 0.2 every 24 hours,consequently,a dust-proof internal display space is created.. Microclimate Control--- To reach a relatively constant humidity and temperature for perfect conservation on displayed exhibits,museum display cases of table design are discretely and invisibly equipped with passive or active microclimate control systems.Passive microclimate control system is usually realized by silicon gel/artsorb/prosorb inside the dedicated metal tray under baseboards.Electronic active microclimate control system inside lower chamber can realize more precise control on desired humidity and temperature in museum display cases. Lighting System--- Lighting system for museum display cases of table design should be always protective and far from heat accumulation and UV or IR radiation so LED bar or fibre optic lighting system is usually proposed.For some special illumination,particular lighting system like swan neck lighting devices can be bespoke on request.Fiber optic lighting systems have extremely low heat and UV output so will not damage delicate items prone to degradation by light and can ideally create theatric display effect by combination of different end light fittings and dimmable light level. Lock System--- As the lock system with the highest security level,Abloy cam locks or push locks can excellently and perfectly resist any physical attacks so as to loyally safeguard the access of museum display cases so the integral security of museum display cases is enhanced.