dor123
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| I've noticed that the arc of my EYE MTD70SDW-7S/3500K Ra96 MH lamp is unusually thin compared to my other 70W MH lamps (Ballast is Philips HID-PrimaVision PV C 70 /S CDM electronic ballast).
Why?
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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.
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RRK
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| May be a dysprosium discharge which is said to be constricted without adding extra salts like thallium or cesium. That brings an interesting idea:
These lamps, last generation of Iwasaki 3000-3500K MH, certainly show some strong afterglow, which likely points to some tin halide content. But these do not have a wide continuous spectrum typical for molecular radiation of tin halides. Also, it is known that previous generation of warm Iwasaki lamps used a dichroic filter to bring down CCT without adding sodium. And also it is known that the last generation of Iwasaki lamps disposed of that dichroic filter, but it is not mentioned, how.
Now, my wild guess is they are using dense brown tin halide vapor as a light filter to tame some blue-green light of dysprosium and to lower CCT. Because of constricted arc in this lamp and generally diffuse nature of tin discharge, tin probably does not get excited by the arc much, so the lamp does not have problems typical for molecular arcs - i.e. poor efficiency because of much energy wasted in IR radiation.
Another idea is that pink afterglow-y lamps from Venture do use the same trick - filtering of blue part by brown tin halide vapor!
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dor123
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My lamp have no dichroic filters. If tin would be exist, the arc would be much more diffused, but it isn't. It is very constricted. Here is my spectrum of the lamp: https://www.lighting-gallery.net/gallery/displayimage.php?pos=-245044Usually in dysprosium MH lamps cesium is used to fatten the arc. Thallium can't fatten the arc. |
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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.
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RRK
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| But these lamps DO show strong afterglow. And salts in a cold lamp look bright orange, which is typical for tin iodide.
The trick like I said may be related to having tin iodide in the lamp, but it does not get excited much by a constricted arc in the lamp and is working as a passive brown pigment.
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« Last Edit: May 07, 2025, 04:47:49 AM by RRK »
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dor123
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| Here is my lamp when it is cold.
Most of the halides have yellow body color, but there are indeed some orange spots.
R U Sure these orange spots are of tin? I won't expect that the arc would be very constricted if there is tin inside. Also I've never seen MH lamps that uses tin and dysprosium at the same time.
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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.
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RRK
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| But yours certainly have that strong yellow-green afterglow usually associated with tin halide fill, right?
I have a couple in 3000 and 3500K and these sure have.
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dor123
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| The afterglow looks orange to me, not yellow-green.
I've never seen a 3000K version. There are 3500K, 4500K, 5500K and 6500K I think.
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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.
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RRK
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| So yours has an afterglow too.
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dor123
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I"m don't speak English well, and rely on online translating to write in this site.
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I only working with the international date format (dd.mm.yyyy).
I lives in Israel, which is a 220-240V, 50hz country.
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RRK
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| So it is evident that kind of Ivasaki lamps have tin halide or some like compound in the fill.
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dor123
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| Have you the spectra of your Iwasaki Ra96 lamps?
But why the tin halide molecular emission isn't seen in the spectrum of Iwasaki and pink MH lamps? Also, why the tin halide don't fatten the arc of my Iwasaki lamp?
And if they uses tin to filter the indium iodide lines in pink lamps, why they don't have Sn-Na for orange lamp, and Sn-Na-Li for reddish orange lamp?
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« Last Edit: May 07, 2025, 06:21:24 AM by dor123 »
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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.
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dor123
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| Also: I provides you two closeup of the red part of the spectrum of my lamp. It have several red and orange and yellow and lime green lines that appears relatively early in the run-up of the lamp, and seems to be not exists in the spectra of lamps like the Osram HQI-BT 400W/D.
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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.
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RRK
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Have you the spectra of your Iwasaki Ra96 lamps?
But why the tin halide molecular emission isn't seen in the spectrum of Iwasaki and pink MH lamps? Also, why the tin halide don't fatten the arc of my Iwasaki lamp?
And if they uses tin to filter the indium iodide lines in pink lamps, why they don't have Sn-Na for orange lamp, and Sn-Na-Li for reddish orange lamp?
I think adding a bit of blue to the orange color makes a better 'reddish' color due to vision physiology. With Sn-Na or Sn-Na-Li you will still end up with 'drifted HPS' orange-red colors. Probably you can not add 'just a bit' of blue In because of low evaporation temperature, and also you always have violet, blue and green mercury llines. So tin halide vapor filtering ends up useful in a pink lamp. I do not have that Iwasaki lamps on hand right now to catch a good spectrum, unfortunately ( |
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« Last Edit: May 08, 2025, 12:22:42 AM by RRK »
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RRK
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Also: I provides you two closeup of the red part of the spectrum of my lamp. It have several red and orange and yellow and lime green lines that appears relatively early in the run-up of the lamp, and seems to be not exists in the spectra of lamps like the Osram HQI-BT 400W/D.
Nice effort, but kinda useless without having spectra aligned and line wavelengths calibrated. You may try to align them using something always recognizable like 589nm resonant sodium line. You may look up spectrums at https://atomic-spectra.net/ and try to guess a familiar red lines pattern. Ca? Dy? Ho? |
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RRK
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Have you the spectra of your Iwasaki Ra96 lamps?
But why the tin halide molecular emission isn't seen in the spectrum of Iwasaki and pink MH lamps? Also, why the tin halide don't fatten the arc of my Iwasaki lamp?
And if they uses tin to filter the indium iodide lines in pink lamps, why they don't have Sn-Na for orange lamp, and Sn-Na-Li for reddish orange lamp?
Well, found Iwasaki spectrums shot with HP320. 3500K lamp is the same as yours (from the same Aliexpress source), 3000K is 150W version. |
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