ES> I live in NE Ohio and have a milky white globe on my drive-way lamppost tha
ES> seems to eat about one light bulb a month. I use the 60 watt size as ES> recommended. My engineer neighbor says that heat build up inside the globe ES> causes the bulb failure (a common design flaw according to him) and that I ES> could make the bulbs last longer if I drilled some vent holes in the globe. ES> Does this make sense?
I have an odd question for you: "I use the 60 watt size as recommended". Isn't that the _maximum_ wattage for the bulb, rather than the required? You can always go with less wattage (as others suggested). True, less wattage is less bright, but here we've found a lamp with less wattage, therefore less bright, looks better: a bright moonlight glow rather than a sharp spotlight effect. (Not to mention saves on the electric bill.)
A 130v or even next one up (145v?) will last longer than a 120v bulb under the same conditions because it is operating further from the maximum design spec. (These are sometimes called 'construction' bulbs.) Running under less than full voltage will give a slightly dimmer light -- probably the effect of a 50- or 55W bulb; not really noticeable.
As another poster mentioned, vibration or some sort of mechanical shock is probably what is killing your bulbs in a month. Using a higher voltage (the 130/145v ones) and/or heavy-duty style such as for a garage door opener or oven should help give a longer life.
Might also want to take a look at the stated lifespan on the bulb's box. 1,000 hours is 41.7 days, running continuously. Turning on an off will lessen the lifespan slightly. A 'soft' on (slowly goes to full brightness) would help lifespan somewhat, as opposed to the 'sudden on' like with a wall switch. (Still better off with increasing the bulb's rated voltage than fiddling with this parameter, IMO.)
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