I have a Belgian 50W Philips CDM lamp (ED shape, medium base) that has a cylindrical arc tube. It works really well and gives a good quality light (842 or 942 colour). However, the base has a split on one side, it extends from the lamp end half way into the threads. Also, there are blueish flashes in the jacket when the ballast attempts a hot restrike. Should I retire it (it is NOS and just used for maybe 50is hours, if that) ? I can't take a picture at the moment as it is lit in my MH table lamp.
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