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Coated M-H Lamps Compared

Coated M-H Lamps Compared

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Needed to find out if the Lithium arc-tube dope was common to many MH lamps. It is! Also was interested in the DX coatings. From top:

1 - Philips 100Watt MV H38JA-100/DX (NEW)
2 - Pair-shaped GE 250w MULTI-VAPOR MVR250/O/U (at EOL)
3 - Philips MH250/C/U (NEW)
4 - GE MULTI-VAPOR MVR250/O/U (Also at EOL)
5 - Philips Master HPI 250W/745 BU

EnergyAdvantage-CosmoWhite.jpg EnergyAdvantage-CMH-comp.jpg coated-lamps.jpg IMG_2466-downtown-spot.jpg

Light Information

Light Information

Manufacturer:various
Electrical
Wattage:250w MH, 100w MV

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dor123
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Jan 12, 2017 at 01:04 AM Author: dor123
Except for the Philips Master HPI 250W/745 BU, the DX coating on the probe-start MH lamps is redundant, as it radiation isn't noticeable in Na-Sc chemistry, as the scandium mask the DX emission with its own emission. With tri-band lamps, there is almost no red emission after the sodium D line, so the DX coating here acts as a fourth band.

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 European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

dor123
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Jan 12, 2017 at 09:27 AM Author: dor123
In most MH lamps that have lithium, lithium comes from the quartz as an impurity.

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 European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

lights*plus
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Jan 12, 2017 at 02:35 PM Author: lights*plus
Interesting. I didn't know that.
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Jan 31, 2017 at 12:34 AM Author: lights*plus
Ok, but for new MV arc-tubes (well, those that were made in 2005 or so), they purified the quartz? Lithium should also appear in those lamps if it is accidental. Like the new 100w DX lamp at top, I haven't seen the 670 nm line yet in any MV lamp. So, I can only assume, more than likely, lithium is placed in M-H arc-tubes on purpose.
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Jan 31, 2017 at 04:18 AM Author: dor123
There is some discussion here at one of Stan's pictures about this subject, why lithium don't appears in the spectrum of mercury lamps, if most MH lamps contains it as an impurity from the quartz, and I don't know where it is located. I think that it have to do with the presence of halides or halogens inside the arctube.

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 European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

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