Homebrew PCBs

I've always used the black light bulbs (fluorescent, not the
incandescent ones) and thought I was cheaping by but I read the same
thing. The wavelength of these is just about perfect. Either the black
light or the 'bug zapper' bulbs are supposed to work equally well (one
just filters more of the visible light than the other but both emit
good UV).

btw - for collimation, my box is all white inside instead of aluminum
foil. I think this works well to even things out.

Phil
KA0HBG

> 
> Data sheets for most of the positive
> resist I have seen would indicate that
> black light (long wave UV) bulbs are
> faster at exposing than germicidal bulbs
> (short wavelength).
> 
> Is the negative resist different to the
> positive stuff ?
> 
> I know that _some_ gemicidal lamps have
> much higher wattage ratings per unit
> length that common black light ones (10's
> of watts 100mmm as opposed to 18W in
> 600mm).
>