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Why does one 120v 400w fixture light a metal halide bulb less brightly than the rest of the fixtures in the room even with a new bulb?
Wiki User
∙ 16y ago
It seems most likely to me that the ballast of the dim one is bad--metal halide bulbs aren't simply connected to the 120 V line voltage but need a "ballast" for several functions, including producing a high enough voltage to start them and regulating the current through them. If one was bad (or was designed for a different bulb), that would explain everything. One other possibility is that there's a wiring problem and either the dim one isn't getting a full 120 V, or the others are getting more than 120 V. If this is a three-phase commercial installations there are various ways to mis-wire things and get odd voltages; in a residential system, you'd pretty much either have 120 or 240, and the 240 would probably quickly overheat a ballast made for 120, so that doesn't sound likely.
Wiki User
∙ 16y ago
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