Probably not yellow glass but yellow phosphor coating. All fluorescent
lamps work by using UV from a mercury vapor light source to excite a
phosphor coating on the inside of the tube. Any missing phosphor will
allow some UV to escape although most glass does block some UV rays.
For what it's worth, Amazon has some 60 w bug lamps.
On 7/22/2013 6:35:23 PM, kabowers@... wrote:
> On Mon, 22 Jul 2013 21:27:19 -0000, you wrote:
>
> >My 60 watt incandescent yellow bug light finally burned out after years
> of use. I checked several stores (Walmart, Home Depot, Lowes) for a
> replacement but none found. Walmart had a 90 watt one but I think that
> would be too bright for my dry film darkroom use.
> >
> >Has anyone had any experience with the yellow fluorescent bulbs used
as a
> dark room bulb?
> I'm concerned that since it is a fluorescent source it may still emit
UV. Or does the yellow glass effectively block the UV?
> >
> >
> >
> >------------------------------------
> >
> IIRC yellow tubes were once used in offset print darkrooms.
> Might be interesting to check with printing supply houses.
>
> Years ago we used 15 watt standard start red tubes
> in the photographic darkroom for printing, even with
> polycontrast paper. Safer than the high dollar Kodak
> gel filters and 2x-3x brighter. We had to wrap a strip
> of black tape on each end because the phosphor wasn't
>
> real good at the ends. Rapid start tubes did not work at all,
> may as well use white.
>
> Keith Bowers WB4LSJ- Thomasville, NC
>
>
>
> ------------------------------------
>