http://images.google.com/images?q=actinometer&sourceid=ie7&rls=com.microsoft:en-US&oe=utf8&um=1&ie=UTF-8&ei=IGeIS-KTM6D8tgP3kpWGAw&sa=X&oi=image_result_group&ct=title&resnum=4&ved=0CCEQsAQwAw

Has anyone used one of these for exposure calculation of UV light?

I have seen them in the old literature.

Curt