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Old 02-17-2015, 04:00 AM   #1
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Default HPS lamp in a MH fixture

Have a gas station to replace some 400 W MH lamps. Some how a couple of the fixtures ended up with HPS lamps. they are dimly lite atm. what kind of damage could this do to the ballasts and capacitor
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Old 02-17-2015, 07:13 AM   #2
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A metal halide ballast runs the bulbs at a higher voltage and lower current vs an HPS lamp which is the opposite.

If the ballast is magnetic I see the damage to the bulbs rather than the ballast. Most magnetic ballasts can be short circuited for some time an not fail as well as tolerating end of life cycling. Electronic is a different story.

A lighting expert would know details but from personal experience I think the ballast will make it.
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Old 02-17-2015, 07:17 AM   #3
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I've read where some grow houses install a switch to bypass the HPS ignighter and use the same ballast and cap to run MH.
That is a very specific application and can't be recommended here but, I've seen it done out of ignorance and have changed them back.
Usually we swap HPS to MH when we have a chance.
For a gas station, and LED retrofit is where I see them heading.
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Old 02-17-2015, 08:03 AM   #4
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Quote:
Originally Posted by electricguy View Post
Have a gas station to replace some 400 W MH lamps. Some how a couple of the fixtures ended up with HPS lamps. they are dimly lite atm. what kind of damage could this do to the ballasts and capacitor
If you haven't performed the job yet, maybe you can sell these to the customer. It's worth the few dollars more in the long run. Put your sales hat on. (I'm assuming you have not seen these, if you have disregard my post).



http://www.benfordfueling.com/shop/page7.html

The change out is a piece of cake (working off a sizzor lift).

If you do this, make sure you measure the opening of the existing fixtures because there are multiple sizes out there and you don't want to go twice.

Edit: These are old technology, I put them in back in the late 90's early 2000's. There may be better LED options out there now, I don't know.
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Old 02-17-2015, 07:26 PM   #5
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Originally Posted by jrannis View Post
I've read where some grow houses install a switch to bypass the HPS ignighter and use the same ballast and cap to run MH.
That is a very specific application and can't be recommended here but, I've seen it done out of ignorance and have changed them back.
Usually we swap HPS to MH when we have a chance.
For a gas station, and LED retrofit is where I see them heading.
I've been under the impression that a MH bulb will work in a HPS fixture due to the ignitor being in the MH bulb, where HPS bulbs need an external ignitor, but a HPS can't be put into a MH fixture.

I know I've changed several HPS bulbs with MH as an experiment (without changing the ballast), and they're still going after a year or so.
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Old 02-18-2015, 12:57 AM   #6
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I once used a retrofit lamp that put a special HPS lamp in place of a mercury vapor lamp and used the old ballast. I suspect it would work on a MH ballast as well because the lamp characteristics are similar to mercury vapor but that was 15 years ago and there are probably better options now....
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Old 02-18-2015, 01:26 AM   #7
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Quote:
Originally Posted by jrannis View Post
I've read where some grow houses install a switch to bypass the HPS ignighter and use the same ballast and cap to run MH.
That is a very specific application and can't be recommended here but, I've seen it done out of ignorance and have changed them back.
Usually we swap HPS to MH when we have a chance.
For a gas station, and LED retrofit is where I see them heading.


I think it might be the other way around, or is probe start MH lamps are being used in a Pulse start ballast. The OCV is to low from an HPS ballast to strike a probe start metal halide, and even with the igniter the bulb would probably strike but extinguish during warm up as the voltage is to low. Mercury vapor bulb wouldn't care, a new MV bulb can tolerate almost any type of over/under voltage/amperage condition.

Tough little buggers as they say over on the UK forum




Quote:
Originally Posted by mikey383 View Post
I've been under the impression that a MH bulb will work in a HPS fixture due to the ignitor being in the MH bulb, where HPS bulbs need an external ignitor, but a HPS can't be put into a MH fixture.

I know I've changed several HPS bulbs with MH as an experiment (without changing the ballast), and they're still going after a year or so.
Older medium and high wattage MH lamps were probe start, but the newer fixtures require pulse start ballast that have an igniter and the MH arc tube only has 2 electrodes instead of the 3rd starting probe.

An HPS lamp will light and run in a pulse start MH ballast though dim with a short life expectancy. I used to do this all the time with low wattage MH lamps back in the day. Worked out surprisingly well in emergencies.


However keep in mind all the above assume 400 watt ballast equals 400 watt bulb.

Run a 250 watt lamp in a 400 watt fixture and you risk arc tube rupture.
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Old 02-18-2015, 01:41 AM   #8
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Run a 250 watt lamp in a 400 watt fixture and you risk arc tube rupture.
Is that covered under Obama-Care?
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Old 02-18-2015, 02:28 AM   #9
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Is that covered under Obama-Care?
As with everything Obama care touches no
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