High Output (HO) Exposure times versus Standard Black Light
Typically, the HO units are
twice as fast the the Standard Black lights. That is to say, the
exposure times of the HO units are usually half of the times of the Standard
Mike K. writes when he compares his 20 watt Black light UV Light Source to his new HO 60 Watt unit:
"I pulled out one of my most popular images.
It is a 10x12 enlarged negative with a density range of 1.92.
On the old 20 Watt UV unit w/ 100% palladium I had to print this negative at 360 seconds (6 minutes).
My comparison shows that the new exposure unit with 60w bulbs prints the same negative in 105 seconds vs 360 seconds with the old unit.
One pyro/pmk negative that previously took 10-1/2 minutes printed in 215 seconds (3min 35 seconds).
"I no longer have time to coat between
sheets or read a book. ;-) "