<x-charset iso-8859-1>Philip: Thanks for all the info. I think the UV A would be fine for this type thing. When I start this project, I plan to go back and retest some stuff in the daylight to judge where I am at on distance, etc. If nothing else, it will be interesting to compare perhaps 7-8 papers using both methods. bob snow =============================== ----- Original Message ----- From: Philip Kagan <peoplex@laplaza.org> snip The lamps I mentioned on my last post (F20T12/BLGE #10244) put most of their energy out at 365 nm. snip You might or might not be able come up with a functional correlation between UV fading, daylight fading. full spectrum fading, tungsten fading, etc., etc. snip =============================== - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions. </x-charset>