Spectra of light from lamps (photo flood lamp, tungsten-halogen lamp, cool white fluorescence lamp, and high fidelity daylight fluorescence lamp) and UV transmittance of glass and its substitutes for display were measured by a spectrophotometer, SR-500B, which was newly installed. Few radiations shorter than 400 nm were found from either the photo flood lamp or the tungsten-halogen lamp, and those longer than 800 nm were found more in the photo flood lamp than the tungsten-halogen one. The cool white fluorescence lamp with high emmission bands between 550-600 nm lacks more than 650 nm red radiation. A halogen lamp emitted only weak UV rays even though it was much brighter than a fluorescent lamp. The halogen lamp also radiated infrared rays which may possibly heat the surface of an object. However, due to the coatings made on the lamp tube and mirror, the emission of infrared rays was negligible. Most of the UV rays (365 nm) passed through three kinds of glass: a normal type, a highly transparent type, and a low reflective type. UV rays were almost perfectly absorbed by two other types of glass, an ultraviolet protected type and a safety type, and a transparent acrylic panel. The two types of glass and the acrylic panel were still completely protective against UV rays even after UV deterioration test of 1060 hours by a fungicide lamp.