Цитата:
Sulfur bulbs also have a quirk having to do with convection. The 5.6
KW bulbs must be kept rotating. Otherwise, a major hot spot will develop
at the top of the bulb, destroying it in something like 1 or 2 seconds.
Use of xenon instead of argon does not help this much. On a smaller
scale, convection MIGHT not be as bad, but I suspect the lamp will still
need a motor.
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Цитата:
As for convection, it not only heats the top of the bulb but also
transports heat from the plasma to the bulb. This may be a significant
energy loss at lower power levels. Efficiency of smaller bulbs may be
significantly improved by rotating them to prevent convection currents.
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Вращают для того чтобы препятствовать конвекции. Только все равно не понятно как это помогает если лампа светит вниз и ось вращения параллельна направлению силы тяжести.
VARIOUS NOTES ON THE SULFUR LAMP