Is there a standard 400 watt open fixture rated lamp?
A. Yes. Many manufacturers rate a 400 watt lamp, in a base up only position, as an open fixture rated lamp. But this does not mean that the arc tube could not violently rupture and cause problems. It can, and it has caused damage and injury in he past. Osram Sylvania has offered a 400 watt true open fixture rated lamp for a number of years. They solved the problem by providing the lamp with an extremely thick outer jacket (rather than a shroud) to contain a potential arc tube rupture. The weight of the entire lamp and the cost is much higher than a standard lamp as well.
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