Response to Sodium Vapor Darkroom Lights

I've also used the Thomas safelights for years. However, I noticed that I was starting to get fogging and after exhaustive testing decided to take the light down and actually look at it. To my suprise the gel filter (sandwiched between glass) which covers the sodium lamp had badly deteriorated and was leaking light like a sieve. Maybe this will save some of you Thomas owners some time.

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