> An interesting aspect of the Halogen lamps is that they need to run
>the envelope at very high temperature as well as the filament to prevent
>boiled off metal from condensing on the envelope and blackening it rather
>than being recycled back to the filament.
>
>Regards
>Tim Hughes
If you have an enlarger with a halogen bulb, it's a good idea to leave it
on for five minutes plus from time to time so that this recycling can take
place. Enlarger bulbs aren't often on for more than a few seconds at a time.
Richard
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