[1FreeAmerican]

Rough Service basically means a thicker filament structure. These bulbs are usually rated for a higher voltage - 130 volts. When operated at normal line voltages - around 117 volts - they will last up to three time longer. I've been using these types of bulbs in my installations for years and would highly recommend them.

[The Antiyuppie]

The bad news is, rough service bulbs may give slightly “redder” light and won’t be as efficient in the usual visible light spectrum. Still, guaranteed to beat the cr#$% out of the garbage flourescents. I have three dead “100W equivalents” of those so far. I can’t afford to save any more money.

[NewHampshireDuo]

The 75 and 100 watt incandescent lamps we’ve bought over the past couple of years have been terribly weak. Give the lamp a good bump and the filament breaks. I’d say we lose more bulbs from mild bumps than from normal end of life.