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#209233 - 03/17/13 04:05 PM HPS lamps in MH fixtures  
BigB  Offline
Member
Joined: Mar 2004
Posts: 719
Tucson, AZ USA
Two metal halide fixtures were accidentally re-lamped with HPS lamps. We were going to switch them back to MH lamps, problem is the HPS lamps are working fine and the HOA wants them in all the fixtures now. I don't even know how they are working with no igniter, but they are working. Not sure how long though, it's only been 3 weeks. Anyone know why they are working and if they will hold up?

Maybe the fixtures were originally HPS and were lamped with MH?


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#209244 - 03/18/13 06:30 AM Re: HPS lamps in MH fixtures [Re: BigB]  
dougwells  Offline


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Joined: May 2003
Posts: 1,140
kamloops BC Canada


#209247 - 03/18/13 11:24 AM Re: HPS lamps in MH fixtures [Re: dougwells]  
BigB  Offline
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Joined: Mar 2004
Posts: 719
Tucson, AZ USA
nope, just plain old HPS lamps


#209301 - 03/23/13 11:07 AM Re: HPS lamps in MH fixtures [Re: BigB]  
Scott35  Offline

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Joined: Oct 2000
Posts: 2,707
Anaheim, CA. USA
There are many varieties of Pulse-Start Metal Halide Fixtures available for Lamp Wattage of 35 Watts up to 400 Watts.

AFAIK, the PSMH Ballast Kits use the same Pulse Ignitors as HPS Ballast Kits - per Lamp Wattage.

--Scott (EE)


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#209366 - 03/24/13 04:40 PM Re: HPS lamps in MH fixtures [Re: BigB]  
NickD  Offline
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Joined: Mar 2013
Posts: 46
Amish Country, PA
Originally Posted by BigB
I don't even know how they are working with no igniter, but they are working.
Maybe the fixtures were originally HPS and were lamped with MH?


Probe-start MH ballasts do not have ignitors, but they are an older (though still current) tech. Pulse-start (new tech) ballasts DO have ignitors.

As to what the fixtures are actually supposed to be, check the transformer for the ANSI code... prefix M for MH, S for HPS. It's typically a letter and two numbers, like M47 or S55.



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