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The lamp in the photo was found when troubleshooting a group of floodlights tripping the breaker feeding them,the cause failure to heed manuf. instructions,the fixture was clearly marked to use ED28 or I believe T18 lamps,the installing contractor used ED37 lamps putting the outer envelope in direct contact w/ the reflector and the wiring on the other side burning off the insulation. My question is what is the cause of the bulge on the arc tube, excessive heat?

P.S. thats a Pushmatic 2 gang all in one panel under the bulb.

Rollie Meyers (NORCAL)