Sylvania – 40 W bulb incandescent Candelabra base E12 multi-purpose light bulb – used for spider lamps, Wall lamps, Enclosed Fixtures and ceiling fans. La Sylvania – Double 40 W bulb for Multi Use – Roof lamp (Bombilla Bombillas have a long life average 3000 hours, last Twice as long as standard incandescent B10. La Sylvania – 40 W bulb from a B10 focus – Roof lamp (a special design feature that has minimized arcing filament from the end of life, and can be operated in any position.