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Metal Halide light weirdness

Cruster

Member
Joined
Jul 30, 2014
Messages
23
Hey gang, there is no end to my ignorance so let's get that out of the way up front.
I just finished my 40x60 shop and a friend gave me 4 large stadium light fixtures that someone gave him. One of them had a bulb and since it didn't work, I bought a new one like it, it is a 250w M58E metal arc with Hg (mercury I guess) stamped on it. I have no electric in the shop as yet except a construction panel loaned to me by my electrician. There is a white and black wire coming out of the ballast that are about #14, I think. So I got the bright idea to hook it up temporarily to have a light source. I hooked it up to a 120v cord and the new light doesn't come on or even try. I had some metal halide lights in my old shop and had a couple of bulbs, and though they were 175w and improper, I couldn't resist testing. I put the mogul based 175w ED 28 in the socket to see if it would explode and amazingly, it came on an seemed to burn normally, though it calls for an ANSI ballast H39 only. I only let it burn until it got as bright as it was going to, which seemed normal and then turned it off.

So, my question is this.....is it possible this is a 240v fixture? and won't run the 250w bulb on this low voltage. The wires didn't look like 240v wires, but what do I know.....very little. So, if any of you pros or knowledgeable folks can point me in the right direction, I would appreciate it as my electrician is gone hunting. Thanks for your time and reading the lengthy post. Please keep the verbal abuse to a minimum :lol_hitti
 
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Norcal

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Mar 16, 2008
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13,754
You'll have to open the fixture & read the data on the ballast.
 

Rookie2

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Feb 27, 2013
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Western Pa.
There should be a label on it somewhere to identify it, if not take it apart and the ballast will have the information on it.

Multi tap ballasts are common, so you may see several loose wires in there with caps on them that can be used for 120,240,277, or maybe 480volts. you may have lucked out and just had the wrong lamp to start with.
 
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Cruster

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Joined
Jul 30, 2014
Messages
23
thanks guys......didn't think about opening one up to find a label. Probably won't know what half of it means, but it's a start. thanks for taking the time to reply. Ron
 

cybrdyke

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Sep 9, 2014
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3,444
Location
USA
If it was used in an industrial setting or as a sports light, it's probably wired for 277 volts. But the ballast will most likely be a "multi-tap" ballast. That means that you can change the connections for 277 to the connections for 120. Do that and it should work.
CD
 

Norcal

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Mar 16, 2008
Messages
13,754
thanks guys......didn't think about opening one up to find a label. Probably won't know what half of it means, but it's a start. thanks for taking the time to reply. Ron

As the old saying goes: "A picture is worth a thousand words".
 
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