Will drilling holes at the top of an otherwise sealed sphere encourage
air circulation and make a light bulb run cooler?

I have a lot of light fixtures that use spherical glass globes to
cover the bulb. There is no air circulation from inside the sphere to
outside, and if I put in a high wattage bulb, it burns out quickly, I
think.

One is a "chandlier", at least it hangs from the ceiling with a chain,
with a glass globe 8 inches in diameter with a 4 inch opening at the
top. Because it is not closely attached to the ceiling, I could drill
holes in the metal part at the top, without weakening it. But if all
the holes are at the top, would that make it run any cooler?

This fixture has a dimmer, and I'd like to use a 150 or 200 watt bulb,
running it at 70 watt brightness most of the time.

(The other fixtures use a 6 inch glass sphere with a 3 inch opening,
and they say not to use more than 60 watts. I don't know what max was
recommended for the chandelier.)

Meirman
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