dor123
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I bought this 5000K 70W MH lamp from aliexpress. Expecting it to have Dy-Tl-Cs, here is the actual spectrum of that lamp: https://www.lighting-gallery.net/gallery/displayimage.php?pos=-258376Having around 5000K light color, the lamp seems to have Na-Sc-Dy-Tl instead of Dy-Tl-Cs. 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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dor123
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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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Medved
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| Because the maker choose so...
Could be raw material availability (at the given factory, with the given machinery), could be targeting certain specific parameters for some reason, could be using old remaining material inventory because someone found some old stash for cheap,...
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No more selfballasted c***
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James
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| I could ask why you chose to eat what you did today - each maker has choices, and there are so many ways to achieve a similar end result. Every company tends to have its own preferred recipe of ingredients, there are no fixed rules.
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dor123
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| But this halide chemistry is very unusual. I've never seen a daylight MH lamps with Na-Sc-Tl-Dy, but only with Dy-Tl-Cs, Dy-Cs and Dy-In-Tl-Na.
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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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dudam001
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| It’s up to the makers, Dor
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Not a big fan of LEDs… (except for indicator purposes).
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James
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| There are many more recipes than just those for daylight MH - very frequently with some or all of the dysprosium replaced by Holmium and/or thulium. Also with additions of hafnium to improve the continuum and CRI. But these details are extremely difficult to identify even with a high resolution spectrometer. Terbium-caesium is not too uncommon, along with various gadolinium / yttrium / neodymium based fills but again very difficult to identify these from the spectra due to the very large number of spectral lines.
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Alex
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feel free to ask questions
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| There is also the problem that just because you, I or James hasn't seen something does not mean it is unusually...
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Glück auf ⚒️
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RRK
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| Sylvania's 35W quartz metal halides with integrated reflectors, included dichroic colored versions, are using this chemistry, rare earth + NaSc. It was discussed on L-G a couple of years ago. So not that rare or strange. I think one of my Chinese 70W MH lamp with ~6K color used this mix, too.
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dor123
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| I think that the said Sylvania 35W MR16 QMH lamp, is I think 3000K color and designed to have the same color stability like CMH lamp, to dispense of the outer jacket, so the arctube would burn in free air.
Is there any advantages of using Na-Sc-Dy-Tl chemistry in daylight MH lamps? Beside the very small additions of Dy and Tl in my lamp, the CRI is poor compared to daylight lamps with Dy-Tl-Cs or Dy-Cs or other rare-earths.
Because of this, I've asked once, why Osram changed the halide chemistry of its HQI-TS/D from Dy-Tl-Cs to Dy-In-Tl-Na.
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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.
|
RRK
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Roman
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| In my experience, Dy + Tl lamps almost always have some hateful residual green tint and some unpleasant metamerism due to a narrow green line, even when made by Iwasaki! So In + Tl + Dy + Na seems to be a better white color at least to my eyes.
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