Weird 1000w Metal Halide Highbay "Pulsing Effect" « on: February 28, 2010, 03:28:35 PM » Author: lightman64
I noticed in the gym at church, where we have 1000w MH highbays, that when you look at the floor or indirectly at the light, there is this weird pulsing effect of cool white- warm white, and then back again. As long as the lights are on, this effect is noticeable. It is only noticeable in one area under a middle-aged, clear lamped fixture. What causes this and why does it happen?
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The future of street lighting is Induction, not nasty HPS lights or cr@ppy LED lights!
Preheat CFL's should make a comeback!

	Re: Weird 1000w Metal Halide Highbay "Pulsing Effect" « Reply #1 on: February 28, 2010, 03:45:06 PM » Author: dor123
1000W Highbay? I never heard or saw such a thing, except of electrodless microwave sulfur lamp highbays (In wikipedia of course). I saw HID highbay fixtures only in 250W or 400W. The pulsing effect may be a non uniform color of the arc in the arctube of the lamps resulting from being probestart MHs and an arc tube shape like these of the mercury lamps combined with vertical burning results in color seperating.
« Last Edit: February 28, 2010, 03:48:29 PM by dor123 »		Logged

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Weird 1000w Metal Halide Highbay "Pulsing Effect" « Reply #2 on: March 02, 2010, 03:46:51 PM » Author: arcblue
The arc has probably become unstable - if you could look at it with sunglasses and if the arc tube hasn't blackened too much, you might even see the arc swirling around. Sometimes the lamps will also "flare" as different halides become vaporized unevenly.
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I'm lampin...