A refrigerated display merchandiser in which is stored food products and which is ordinarily exposed to prevailing ambient light is provided with transparent sheets which function as filter media to prevent harmful light from reaching the foods stuffs. The filtering media comprises a transparent sheet affixed to the display merchandiser as well as about any fluorescent lighting disposed within the merchandiser. The transparent sheet is either clear (untinted), or tinted, and passes either red or blue light or alternatively, absorbs ultraviolet light including both UV-A light and UV-B light.