DX coated metal halide lamps? « on: March 18, 2014, 12:26:51 AM » Author: themaritimegirl
I was outside the mall waiting for the bus this afternoon, and I looked up at the several downlighters that light the entrance area. I noticed that the lamps inside them, which I assume are metal halide lamps, had a color identical to a DX-coated mercury vapor (or at least, my Philips Lifeguard mercury vapor lamps). A kind of purple-like color halfway between a white and cool white fluorescent, very pretty. I just did some looking here, and it seems DX-coated MH lamps do exist. Could the lamps I saw have been them? Or are there MH lamps that naturally emit a color similar to a DX MV? I could try and identify the lamps I saw, although I'm not comfortable with the idea of staring up at a light fixture in public.
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	Re: DX coated metal halide lamps? « Reply #2 on: March 18, 2014, 01:23:49 AM » Author: dor123
I've seen many /DX coated MH lamps in Israel. Mainly Venture 70-150W, but also GE Multivapor 400W and Philips HPI-BUS 400W.
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	Re: DX coated metal halide lamps? « Reply #3 on: March 19, 2014, 06:37:54 PM » Author: themaritimegirl
Interesting. Are most coated MH lamps DX? I notice many say "4000k", but I couldn't find any that specifically said DX.
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	Re: DX coated metal halide lamps? « Reply #4 on: March 20, 2014, 12:35:49 AM » Author: Medved
I would guess many coated MH's have just a diffusion layer, not a phosphor. The Na-Sc is usually about 4000K just the arc, so does not need any color correction.
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	Re: DX coated metal halide lamps? « Reply #7 on: March 20, 2014, 02:13:24 AM » Author: dor123
I've seen many Na-Sc of Venture and GE and the Philips HPI-BUS tri-salt lamp, have an Eu: YPV phosphor red emission in the spectrum during run-up, when only the mercury ionised. In the Philips HPI-BUS, you can see this phosphor emission also during full regime, as a fourth red band. I've also seen several 70W internal starter HPS lamps in Qiryat Ata, which have this red phosphor emission during run-up.
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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: DX coated metal halide lamps? « Reply #8 on: March 20, 2014, 02:49:43 PM » Author: Medved
It is true, when the YPV is the same cost or even cheaper than other (just diffusing) materials, why not to use it just as a diffuser...
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	Re: DX coated metal halide lamps? « Reply #9 on: March 25, 2014, 10:18:48 AM » Author: Silverliner
Some of the metal halide lamps used in North America are definitely phosphor coated. The sodium scandium lamps are somewhat lacking in the red end of the spectrum, so phosphor is used to increasse the red content. CMH and other non-sodium scandium MH lamps have sufficient red, so the coated lamps use just silica for diffusion.
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	Re: DX coated metal halide lamps? « Reply #10 on: March 25, 2014, 03:44:14 PM » Author: themaritimegirl
Interesting, thanks guys. With this in mind, I wouldn't mind grabbing such a 50 watt MH lamp someday (I'm possibly getting a 50 watt MH ballast for my MV fixture, anyway). Too bad I fear their violent method of EOL.
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