Plan long-term exhibits in the areas with the lowest amount of daylight. Never put wood pulp paper, fabrics, colored prints, or watercolors on permanent exhibit. The next priority is to manage artificial light sources carefully. To avoid heat build-up, place objects no closer to light sources than is necessary for adequate illumination. If incandescent bulbs must be placed in cases, vent the tops of the cases.
Plastic sleeves are available for fluorescent tubes to filter ultraviolet light.
If the museum can afford the investment, ultraviolet shielding plastic or varnish can also be applied to windows. Check with your nearest glass distributor or try one of the following sources. The lowest practical levels of light are achieved when light is directed toward objects rather than the areas where visitors stand. Finally, remember to turn off all lights when the museum is closed or an area is not in use. For a museum to function, light is a necessary part of the environment.