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Halogen lights and UV


I recently bought some 500W halogen work lights - they came with external
UV shields, and a warning not to operate them with the shields not in place.

I have an older halogen house lamp without a UV shield, but it points up at
the ceiling, so illumination is entirely by reflection from the ceiling.

(Additional data point - I tried to use the older lamp to cure some "UV cure"
adhesive, but it didn't work. Maybe the adhesive requires the shorter 
wavelength UV, though it's supposed to cure in sunlight.)

John R


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