One interesting thing I notice from time to time are these dark spots forming in CFLs, they seem to occur more frequently in the PL type lamps, but ive only ever noticed this in compact fluorescents, can't say ive ever seen this happen in a linear, non-self ballasted lamp. The pic below is one I noticed today, this one isn't that bad. The worst ive seen was a GE Biax PL with nearly 1/4 of the tube (near the U-bend) completely blackened and producing a faint blue color out of only the black area. Anybody know what causes this, and why it only seems to affect self ballasted CFLs?
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