I think the arc tube leaked. This happened to my GE 400w Lucalox High Pressure Sodium bulb. I think the reason why the arc tube leaks even though the bulb didn't exceed rated life is either a manufacturing defect or the arc tube was subject to shock or it wasn't sealed properly. The solution to this is to get a new bulb. Usually when HPS lamps go EOL after thousands of hours, the whole bulb becomes frosted metallic color and the sodium coats the outer envelope.
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