Melinda,

Light levels are dependent upon the materials that the collection are 
composed of. A red silk dress, for example, will require much lower light exposure 
than a cast iron kettle. It is also dependent upon the mode of storage for the 
collections. If objects are in acid-free boxes or in drawers than the room 
lighting will not be much of a concern.

As a general rule collections storage lighting levels are not as stringent as 
for items on exhibit as long as the collections are enclosed.

Cheers!
Dave

David Harvey
Conservator
Los Angeles, California USA

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