www.deadbread.com/crumbs/23c.html Hey, that's my website!
I've just built a second LED head to improve on the original. It's white LEDs + UV LEDs combined. The head is finished and on a new enlarger. I'm currently testing the new head and until I've done some extensive printing I won't have anything concrete, but so far the UV LEDs did the trick. It's an excellent match for a 5+ filter on my condenser and cold light enlargers.
As part of the testing process I test printed with blue only (470nm) LEDs. They didn't have near the contrast of UV (405nm) LEDs on variable contrast paper.
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