Homebrew PCBs

John,
Is you want to cut down on the heat I have used 120Watt Plant Light
reflector lamps.
GE part number 120BR40/PL at the home depot for a few $$
When I use this lamp, instead of 70 Seconds Exposure (as I do with GE
EBW No.2 500W Blue lamps ) I give it about 110-120 Seconds

Hans W

bjeff65 wrote:

>  --- In Homebrew_PCBs@yahoogroups.com, "John Myszkowski"
> <myszka_us2000@y...> wrote:
> > I can shed some light on the bulb wavelength...
> >
> > All regular incadescent bulbs have very little UV generating
> ability.
> > [edited for brevity]
> >
> > Incadescent, Halogen bulbs do produce a high level of UV light.
> > [again edited for brevity]
> >
> > Fuorescent bulbs. These bulbs, when totally uncoated generate only
> > (Mostly) UV. Extremely little visible light is generated by the
> > fluorescent tube (when uncoated). The visible portion of light
> coming
> > from the fluorescent tube is generated by the fluorescence of the
> > various powders that coat the inner surface of the tube.
> > The wavelength generated by the tube (other than UV) is determined
> by
> > the composition of that powder.
> > ALL fluorescent bulbs generate UV, but the everyday bulbs sold for
> > home use have  a powder coating that both blocks the UV as well as
> > generates only visible "white" light.
> > The power of these tubes is determined by the length and diameter of
>
> > the tube (plasma guide). Therefore, if the tube is the same length
> > and diameter as a normal 40Watt tube, then it is a 40Watt tube.
> >
> >
> > John M...
>
> John,
>
> Thanks for enlightening me! I find it almost amazing with such a clear
>
> disparity
> between the possible sources that I really haven't seen such a clear
> explanation until now.
>
> So my original question has a definitive answer: Get a fluorescent
> black light bulb. Period. End of discussion. It's easy to extrapolate
> from your discussion
> above that a  BL or BLB fluorescent bulb is coated to filter the
> visible light and allow the UV-A through.
>
> I've found an interesting site in my continuing search for info. Of
> all places it's a Halloween haunted house type site. It talks about
> Black Light sources and has a pointer to what I would now consider the
>
> Holy Grail: compact fluorescent black lights. You can find it here:
>
>
> ttp://wolfstone.halloweenhost.com/TechBase/bltgen_BlacklightGeneration.html
>
> So unless someone has compelling evidence to the contrary, I plan to
> build my light box using a pair of 12 in BLB fluorescents which are
> easily found at the Home Depot or WalMart.
>
> Thanks for the help,
>
> BAJ
> > ================
>
>
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