Metal Halide Problems

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Old 11-26-15, 04:19 PM
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Metal Halide Problems

Help me do my job here guys, I'd like to go to my jman tomorrow with solutions and not problems!

I'm having issues with three 250W metal halide lights installed on my site.
Light A is on its own circuit, lights B and C are on there own circuit. Both circuits are wired to a contact controlled by a photocell. Photocell power is tapped off of B and C's circuit. Neutral is shared.
They are all working sporadically. There isn't an issue every morning, just on occasion. Today, lights B and C were both off while light A was on. Later in the day, I tossed my glove over the photocell, and B and C fired up while A struggled to come to life. I've also seen A and B working while C was not, and A and C working while B was not. Most times though all three are fine.
So troubleshooting... Right off the bat I know the photocell works so long as even one light is on. Any combination of A and B or A and C on rules out the contact. But I dug around anyways.
- 120V across the board at the contact. Line, load, control.
- 120V at the fixtures
- 120V taps used
- Ballasts and bulbs match (bulbs came in lights from distributor)
- Thought maybe one of my guys didn't seal up the L16s, but they did and no moisture was present in the lights
- Extra wire on taps stripped to ensure a solid connection
- No damaged wires

Aaaaaand I'm out of ideas. I'm not convinced I haven't done something wrong or overlooked something. 3 bad bulbs or 3 bad ballasts seems too far-fetched to me.
Any ideas guys?
 
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Old 11-26-15, 04:45 PM
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How far are the lights away from the contactor ?
You have 120v at the contactor but what about out at the lights ?
 
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Old 11-26-15, 04:55 PM
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Are the fixtures and ballasts properly grounded? Are the lamps mounted in correct orientation for type of lamp (Base UP, Base Horizontal, etc)?

Any relation of them acting up to temperature?

Do these use external pulse starters? If so, are they mounted too far from the lamps?

That's all I got....good luck!
 
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Old 11-26-15, 08:49 PM
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Lights are 10', 20', 30' away from the contact. 120V at fixtures. Everything is bonded. Fixtures mounted properly. No starters. Temperature was on my mind, they didn't start acting up until we hit about -15. Who the hell would sell outdoor fixtures in Canada that can't handle the cold though?
 
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Old 11-26-15, 08:55 PM
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As the lamps get older they will have a harder time striking an arc in the cold weather.
 
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Old 11-26-15, 09:01 PM
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Brand spanking new. Just got installed 3 or 4 weeks ago.
 
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