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Osram Powerstar HQI-T 250 W/D on S50 HPS ballast

Here is the properly driven, rather boring spectrum of OSRAM's HQI-T 250watt W/D lamp as per advice of valued LG members. The significant difference is that the mercury lines, as well as the thallium green line, become buried in the vast array of lines from the rare-earths. The ultraviolet has also nearly disappeared as compared to the underdriven spectrum using a 250w M138/M153 MH ballast. It only took a few seconds to go through the blue-green phase to a pleasing bright daylight tone w/the S50 HPS ballast. The actual lamp is pictured.

Light Information

Lamp
Manufacturer:	OSRAM
Model Reference:	HQI-T 250 W/D
Lamp Type:	metal halide
Shape/Finish:	E40
Fixture
Ballast Type:	S50 High Pressure Sodium (North America)
Electrical
Wattage:	250w
Optical
Color Temperature:	Daylight

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Filename:	Osram-HQI-T-250-WD_S50-HPS~0.jpg
Album name:	lights*plus / Lamp Spectra
Keywords:	Lamps
File Size:	1444 KB
Date added:	Jul 29, 2015
Dimensions:	1818 x 2000 pixels
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URL:	https://www.lighting-gallery.net/gallery/displayimage.php?pos=-110547
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dor123
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This is how the spectrum of this lamp, should be look like, when operated correctly. Much better than on the pulse-start MH ballast.
What is strange is why the UV output, disappeared.

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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George Liv Photo

Yes I find the UV disappearance interesting. Actually if you can increase your screen brightness to max, it looks like the major line (in underdriven spectrum) has pressure broadened. Also the yellow 577-579 nm MV lines have broadened.

dor123
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This would be the opposite, as in the S50, the arctube loading and temperature is higher.

wishus
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I find your spectral analysis photos very interesting, lights*plus.
May I ask what you use to get these fine and detailed spectra?

Interested mainly in discharge lighting (mercury, sodium, neon) and also old and unusual incandescents.

lights*plus
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George Liv Photo

I'm uploading a few pics in this Lamp Spectra section which shows the home made spectrograph I assembled. I also modified some low cost digital bodies to be able to record the UV & IR parts of the spectrum.

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Very nice spectral recording, light*plus! The disappearance of mercury's UVA line cluster around 365 nm (and of other Hg lines) is caused by a discharge operating at a lower temperature due to the higher density of rare-earth atoms and molecules, which have strong radiative-cooling effect on the plasma.