Homebrew PCBs

James wrote:
> /BL tubes are a better choice than /BLB. The Woods glass used to block visible light in the /BLB also blocks some of the UV output.

These aren't Wood's Glass -- I've got an F4T5/BLB somewhere, which is a 
deep purple/black colour when switched off; these tubes are off-white 
and look like normal white-light fluorescent tubes. Well, aside from the 
blatantly obvious "WARNING: EMITS UVA LIGHT WHEN OPERATING -- AVOID 
PROLONGED EYE OR SKIN EXPOSURE" warning on one end of the tube.

According to the specsheet I've got, "350BLB" means it's a 350nm 
blacklight (near-UV / UVA) tube with a strong UV emission. Pretty much 
exactly what you'd want for photoresist. Sold for use in fly-killers, 
interestingly enough.

-- 
Phil.
ygroups@...
http://www.philpem.me.uk/