I believe it is because it is a very narrow range of UV light that has trhe influence over the conversion process. (i.e., 280-315 nm)
__________________  Ride hard, Ride long....git put away Wet each and every time....no holdin' Back.....enjoy the journey ...... cuz that's ALL there is! Walk on and walk tall folks!
Last edited by tahoe58; 11-26-2007 at 01:57 PM.
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