Author Topic: Greened out MV bulbs....  (Read 3900 times)
lightman64
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Greened out MV bulbs.... « on: December 15, 2008, 07:51:44 PM » Author: lightman64
what happens after a MV bulb greens out? does it get dimmer?
« Last Edit: December 15, 2008, 07:54:22 PM by lightman64 » Logged

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Foxtronix
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Re: Greened out MV bulbs.... « Reply #1 on: December 15, 2008, 07:55:16 PM » Author: Foxtronix
A mercury vapor lamp generally gets dimmer and dimmer until it can't light anything! There are also a few cases of violent failures (explosion) of just stop to work suddenly, but such cases are very rare.
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Re: Greened out MV bulbs.... « Reply #2 on: December 15, 2008, 07:56:28 PM » Author: Mr. Big
Your forgetting an MV lamp has a very small chance to explode, an MH, has a 99% chance of exploding!  ::)
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Foxtronix
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Re: Greened out MV bulbs.... « Reply #3 on: December 15, 2008, 07:58:05 PM » Author: Foxtronix
Rudy: That's what I said. Also we aren't talking about metal halide lamps..  :-\
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lightman64
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Re: Greened out MV bulbs.... « Reply #4 on: December 15, 2008, 07:58:26 PM » Author: lightman64
weird... the bulbs in my gym are MV and they just quit. (high bay lighting - installed in 1974 ; most fixtures have been converted to MH but some still MV) MH just quis too- not the ballast either
does anybody know whats going on??
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Re: Greened out MV bulbs.... « Reply #5 on: December 15, 2008, 08:05:59 PM » Author: Foxtronix
This is a system for shutting the lamp off at his end of life to prevent a eventual explosion. Also if lamp just quit there is 99.9% of chance that the high bay fixtures are MH since MV ones don't have a such system.
« Last Edit: December 15, 2008, 08:07:44 PM by TiCoune66 » Logged

lightman64
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Re: Greened out MV bulbs.... « Reply #6 on: December 15, 2008, 08:07:18 PM » Author: lightman64
so thats why....   thanks!
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Re: Greened out MV bulbs.... « Reply #7 on: December 16, 2008, 12:07:07 PM » Author: lightman64
it says that they are 750 watt MV bulbs on the breaker- but u probally are right
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Re: Greened out MV bulbs.... « Reply #8 on: December 18, 2008, 06:15:19 AM » Author: TudorWhiz
if they are 750 watt MVs, there is a chance they were self ballasts! So they probably broke filaments and had no continuity?

I have a lamp that is self ballasted and in 208 volts for usually gym lights. Here is a picture, this one is not mine but I have same one see here
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lightman64
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Re: Greened out MV bulbs.... « Reply #9 on: December 18, 2008, 10:18:31 AM » Author: lightman64
i checked and they aren't self ballast. they might not be 750 watt maybe less
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Re: Greened out MV bulbs.... « Reply #10 on: December 18, 2008, 11:14:05 AM » Author: TudorWhiz
perhaps 250 watt?  also they can just go out because commonly for MV, the starting probe would get conflicted with the bottom electrode OR no emitter on the probes....

one of the other common MV dying is sometimes they go on, sometimes they dont, while other days it will work....I see this often on streetlights, when some days it lights up and other days it doesn't...a good touch of the lamp will fire it up (static) or even better  I use a BBQ ignitor!
« Last Edit: December 18, 2008, 11:16:00 AM by TudorWhiz » Logged

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Re: Greened out MV bulbs.... « Reply #11 on: December 18, 2008, 04:03:10 PM » Author: lightman64
well in another gym the fixtures are smaller but 400 watt. (MH though)
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Re: Greened out MV bulbs.... « Reply #12 on: December 26, 2008, 07:14:28 PM » Author: Foxtronix
About the "750W MV" breaker: maybe the electrician that serviced it had absolutely NO idea of the wattage and the lamp type, so he wrote this. Also if they really look like mercury it's possible that they're mercs that run on MH ballast.
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lightman64
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Re: Greened out MV bulbs.... « Reply #13 on: December 27, 2008, 07:31:59 PM » Author: lightman64
i think they are mercs that run on a MH ballast. the gym was built in 1974
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Re: Greened out MV bulbs.... « Reply #14 on: December 30, 2008, 01:11:29 PM » Author: TudorWhiz
they dont make mercs that run on MH ballast

do you mean ballasts that runs both MV and MH? If so they would be both same wattage......
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