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Hi. We have an old (1970's-ish) outdoor lamp, automatic on/off. I think it's mercury vapor - the label says: USE ONLY MV-175 WATTS, TYPE H39 LAMP, 120V 60Hz AC Max 4.0A ...
It's been working fine for 40 or 50 years, but lately it sometimes fails to turn on, or turns on hours later than is should.
Any ideas why it would fail only intermittently?
It's been working fine for 40 or 50 years, but lately it sometimes fails to turn on, or turns on hours later than is should.
Any ideas why it would fail only intermittently?