Light bulb sockets and wattage ratings
The wattage sticker depends on how close the bulb is to other things above and whether the bulb is enclosed.
THe 650 watt socket rating probably applies only when the bulb is positioned base down or sideways with no shade or cover.
Standard screw in light bulbs in the U.S. (medium base) rarely have wattages over 300. There is a larger base (mogul) for which incandescent bulbs up to about 1000 watts are equipped, also a number of mercury and sodium bulbs use this size base.
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Last edited by AllanJ; 10-17-2010 at 09:45 AM.