Been there done that.....firstly I used an un-shielded 7w LED bulb and it took the colour from a wooden stock adjacent to it. Be very careful with LED it seems to have some detrimental light wave lengths . Shielded it with lead and it is now working as planned. The idea is to provide air circulation from the low heat generated by the bulb. Warm air will retain more moisture than cool air so heating can be counter productive unless the heat moves the air ie mounting the heat source low so warm air is constantly rising to provide some air movement. Do some more research on archives and storage thereof.....!
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