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Old 02-01-2005, 08:54 PM   #1
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Metal halide bulb need help! Attention Darin at CaptiveReefs

I just wired up my new metal halide system and when I plug it in the bulbs center turns on for a bit and then goes out. I left it plugged in and it keeps doing this and doesn't turn on fully. It has been on for about 5-10 min. It is a new bulb too. Is this normal?

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Josh
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Old 02-01-2005, 09:41 PM   #2
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I had the same question when I first set mine up. It generally takes mine up to 15 minutes to fire up. Turn it on and let it sit for a while.
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Old 02-01-2005, 09:47 PM   #3
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It was sitting there for like 45 min and kept doing the same thing
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Old 02-01-2005, 10:50 PM   #4
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bump
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Old 02-01-2005, 11:19 PM   #5
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From an electrician standpoint: If it is a new bulb, the ballast may be bad, although I have seen new bulbs that were bad. Without checking voltage it would be hard to diagnose. That said I have never dealt with MH for aquarium applications, so I don't know if there is any difference in their design and a standard MH fixture. For safety sake I don't advise checing the voltage if you are not experienced, as some MH fixtures put out 300+ volts.
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Old 02-01-2005, 11:26 PM   #6
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I had the same thing happen to me. At first, the bulb would fire up after 15 minutes. Then, it would fire after 30 minutes, etc. Eventually, the bulb went out completely. I replaced the bulb and the ballast, and all along it was the bulb. It does happen even with new ones.

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Old 02-02-2005, 12:43 AM   #7
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Make sure you have the right ballast with the right bulb. As far as I know there are some pulse start and probe???? start bulps and balasts out there.
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Old 02-02-2005, 12:48 AM   #8
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It is a coral vue 250w electronic ballast with a mogul socket and 250w 20k metal halide bulb. I have had it on for probably an our now. The arc turns on for like 5 seconds then goes out. This happens about every minute. I read somewhere that this happens with new bulbs but I figured that mine would have turned on fully by now. If someone with a lot of metal halide experience could chime in that would be great. Maybe Darrin at captive reefs could help me out.
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Old 02-02-2005, 12:51 AM   #9
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Does it just flicker shortly every minute? If so, it is most likely the bulb. This was the final straw with one of mine. I ended up replacing the ballast for no reason.

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Old 02-02-2005, 12:55 AM   #10
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It doesn't really flicker, it comes on for like five seconds (not super bright) and then goes off. Here is that site that I was reading stuuf about metal halides.

http://www.marinedepot.com/aquarium_....asp?ast=&key=

Tell me what you think.
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