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Tool Talk Discussion Forum

Do metal halide lights fade?

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Andy

04-06-2004 13:39:07




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I am looking at light options for my shop. I have been leaning towards metal halide lights. I recently read some information,(from a florescent light company) that metal halides loose their brightness over time, up to 49%. Does anyone have some experience with this. All information appreciated, thanks




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John K

04-08-2004 09:20:45




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 Re: Do metal halide lights fade? in reply to Andy, 04-06-2004 13:39:07  
If you check, you will find that fluresecent light fade as fast or faster than MH. Also more prone to maintenance with floresecent fixtures, plus is that they are instant on. I find it hard to believe by some posts below that fluresect fistures bing more efficient than MH. I believe that the most efficent is Low pressure sodium then high pressure sodium, metal halide, mercury vapor than flouresent and last is incandesant. This is based on lumens out put per watage rating. For every 100 flouresent fixures I repair, I may repair 2 high bays.

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ScottT

04-08-2004 11:00:03




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 Re: Re: Do metal halide lights fade? in reply to John K, 04-08-2004 09:20:45  
I'm just relating my experience.
We measured actual foot candles on the floor with the new fluorescent fixtures drawing 227 watts, vs. metal halides and low pressure sodiums drawing 465 watts. The new fixtures were equal or better.
There are numerous manufacturers changing over, a few you may have heard of: (Simplicity, Kohler, Quad Graphics, Caterpillar).

Link

Scott

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ScottT

04-07-2004 10:14:24




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 Re: Do metal halide lights fade? in reply to Andy, 04-06-2004 13:39:07  
I would go with fluorescents as well. Besides instant light you can save substantial money on your electric bill. There are several companies that make fluourescent fixtures that put out the equivalent light of 250 or 400 watt metal halides while using 1/2 the power. So far we have replaced over 400 high pressure sodium fixtures at work resulting in more than $40,000 in annual energy savings.
The fixtures are comparable in cost to an industrial metal halide.

Scott

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JerryU

04-07-2004 05:53:25




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 Re: Do metal halide lights fade? in reply to Andy, 04-06-2004 13:39:07  
Yes, but not as bad as mercury lights. Mercurys will dim to almost nothing and not burn out. Metal halides keep their output at a much higher level. Really for shop use, you will not appreciably notice the reduction in either flourescent, metal halide, or high pressure sodium. For a shop, I would go flourescent. The metal halides have a strike time of up to 5 minutes. Frustrating when you need to turn on the light to find a part or if you have a power "blip".

In an unheated shop, there are new low temperature ballasts that will fire at zero. I have a barn and use flourescent yard lights, but I don not have it extremely well lit. You will pay an arm and a leg for MH lighting vs. flourescent.

The MH lights are generally used in industrial and commercial applications. In industrial, the high pressure sodium have even replaced them, although color rendition is not as good.

Check on cost of replacement bulbs as well.

FWIW

JU

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chris mf135

04-06-2004 16:13:52




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 Re: Do metal halide lights fade? in reply to Andy, 04-06-2004 13:39:07  
yes they do. however ALL BUT INCADESANTS DO.go with mh.grainger cat list fade spects on all hid bulbs.



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RayP(MI)

04-06-2004 16:11:11




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 Re: Do metal halide lights fade? in reply to Andy, 04-06-2004 13:39:07  
Well, the high performance projector bulb in our computer/video projector appears to be fading as it ages. Suspect that you will have another problem, however - all the halogens I have had seem to have a short service life compared with conventional bulbs, and far shorter life than florescents.



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