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Metal-halide Lamps Compared

Metal-halide Lamps Compared

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The spectral variations in the many different Metal-Halide lamps available.

At bottom is inserted a 6500K aquarium lamp. Thanks to dor123 for that spectrum.

metal-halide-lamps-composite.jpg SodiumSpectraBroadening.jpg SpectraCompsosite.jpg Circadian-vs-LED-Scotopic-P.jpg

Light Information

Light Information

Manufacturer:Numerous
Lamp
Lamp Type:Metal-Halide and Ceramic-Metal-Halide

File information

File information

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Filename:metal-halide-lamps-composite.jpg
Album name:lights*plus / Lamp Spectra
Keywords:Lamps
File Size:725 KB
Date added:Jul 28, 2020
Dimensions:1971 x 2464 pixels
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URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-183153
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lights*plus
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Jul 28, 2020 at 04:00 AM Author: lights*plus
I had to show the spectral variations in M-H lamps for my last eBook so I produced this composite.

Recently I added a spectrum taken by dor123 of a 70W double-ended aquarium lamp rated at 6500K! The spectrum was very nice and I inserted it near the bottom. The lamp fill is similar to the Powertone MHW-TD lamp (at bottom) but without lithium or sodium. The sodium (Na) does show up as an impurity likely from the arc-tube.
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Jul 28, 2020 at 04:09 AM Author: dor123
Looks like my Odyssea MHQ-T 70W 6500K contains dysprosium as the rare-earth (All of the red lines are presents in the Osram HQI-TS 70W/NDL Excellence and Philips MHN-TD 70W 3000K spectra).
But what is the line at violet end of my lamp spectrum?

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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Jul 28, 2020 at 04:19 AM Author: lights*plus
There are missing lines at 498nm from Na, and also notably missing is the 569nm Na line. See the bottom scale where I marked the elements. So there is no sodium at all except for what is probably a trace (at 589/590 nm).
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Jul 28, 2020 at 04:21 AM Author: lights*plus
About the violet feature.. it could be gallium. I know for sure it is NOT indium.
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Jul 28, 2020 at 04:24 AM Author: dor123
But what is the broadened line at violet end of my lamp spectrum? The area looks different with the rest of your lamps spectra. It can be gallium? Also: Dysprosium and thallium alone can't produce 6500K, so there should be other element that rise the CCT to about 6500K, and my lamp have what looks like a broadened self-reversed line at the violet. Is it gallium?

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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Jul 28, 2020 at 04:26 AM Author: dor123

About the violet feature.. it could be gallium. I know for sure it is NOT indium.

I see you already answered me. When the lamp run-up, it appear narrow and broadens as the pressure increase. According to James Hooker's site , gallium should have 3 lines, not a single one.

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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Jul 28, 2020 at 04:30 AM Author: lights*plus
Gallium doped metal-halide lamps are made for UV curing. But I haven't found any good diagrams showing the spectrum of these lamps.. a peak, however, does appear near 413 nm, which is in the general position of the broadened violet feature. There is another peak near 403 nm (close to the Hg line) but radiational cooling might be playing a role here where the near UV and far violet is suppressed (so cutoff in my spectra is at around 407nm).
dor123
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Jul 28, 2020 at 04:55 AM Author: dor123
So probably this is indeed one of the three lines of Gallium, and the rest aren't seen by my camera, because they are of too short wavelength.

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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Jul 28, 2020 at 05:50 AM Author: dor123
Update: I installed my Sylvania HSI-TD 70W/D in my tracklight and turned it on, in order to capture a better spectrum of it, using my DVD-RW, which produces better results with my camera, than the CD-R, in order to compare its spectrum to my Odyssea MHQ-T 70W 6500K aquarium MH lamp, and have the same halide chemistry as the Osram HQI-BT 400W/D using 400W HPS ballast: https://www.lighting-gallery.net/gallery/displayimage.php?pos=-183161
Looks like the line at the violet which we thought as gallium, is actually from dysprosium. Looks like it simply have Dy-Tl-Cs + sodium as impurity, and that the dysprosium pressure is very low compared to the Sylvania HSI-TD 70W/D, as a result of lower dose or lower arctube temperature, and hence the color is shifted to around 6500K.

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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