1. Inverted: Strike One
2. basement - high vibration load (from steps upstairs): Strike 2
3. basement - high number of on/off cycles: strike 3
I'd suggest the Phillips brand going forward and read the box for use in enclosed or inverted fixtures. They will say if it's OK.
Or it could just be a bad bulb...
1. Wrong. According to mfg, this bulb is OK for inverted use. That was the first thing I asked the GE rep to confirm what I thought I had read on the packaging when I purchased the bulbs.
2. Wrong. The ceiling in the part of the basement in question is a reinforced concrete slab with almost no overhead traffic. Unless we get an earthquake, the ceiling isn't moving. The guy who built the house during the height of the Cold War called it "The Shelter" on the blue prints. The room is literally a poured concrete box.
3. Wrong. This light is probably the least used light in the house. The last time I turned the light on in this room was probably a month ago. I turned it on and left it on today for a few hours to move stuff into the room.
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