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When you want to use a MH bulb in an HPS ballast you must use a conversion bulb. It must be the same wattage as the HPS bulb

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Q: When you need to use metal halide conversion bulb?
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How do you ignite a 400w electronic metal halide or high pressure sodium bulb?

You need the appropriate ballast for either of these bulbs to make them light.


Can you use a 70 watt high pressure sodium bulb in a 100 watt ballast?

No. The bulb has to match the ballast wattage exactly. And you can't interchange different lamps (like metal halide) either. The ballast is specific to that wattage and lamp type. The bulb will either burn out quickly or just not work properly at all


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The size of wire and breaker sizing are based on the current of the circuit. To answer this question a voltage must be stated or look on the ballast for the amperage and add that to the question.


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Can you use a hps bulb in a metal halide fixture?

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How can you tell if the halophane light you have is a metal halide or high pressure sodium?

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How do you change the tail lights in a 1994 Ford Thunderbird?

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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?

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.


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