dor123
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| Before Osram made the HMI short-arc dysprosium lamp, they made an experimental HBI short-arc indium lamp, which had great advantages like no UV radiation.
Why The HBI didn't made it to the entertainment industry, and the dysprosium HMI lamp did this instead?
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James
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| Because HMI had better colour rendering, efficacy, life, consistency and optical performance
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dor123
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@James: How dysprosium have better CRI, life and optical performance? At the very high pressure of the indium, the spectrum should be a molecular continuous spectrum, with only dips in the blue by the cold indium vapour pressure.
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RRK
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| Bad efficiency, particularly due to high leak of energy into useless near-IR I guess...
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dor123
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@RRK: Can you show me the spectrum of blue indium lamp in the IR, to see the IR emission of the indium?
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RRK
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| Well, here is a spectrum from somewhat overloaded 70W indium lamp. It is run at nominal power but already looks a bit overheated. Poor lamp design and/or reflector backscatter probably. Anyway, you see a nice CRI score, but significant energy spills into useless near-IR (beyond some-650mn) and also into useless UVA (beyond 400nm).
There is certainly an indium line inversion, but HP320 does not have a resolving power to see it.
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dor123
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| Just a shame that your Aliexpress spectroscometer longest wavelength recording is 780nm.
But the only NIR emission I see, is the molecular continuous radiation of the indium, which is the same as the visible one.
And how the CRI is 92? The spectrum looks exactly like that of my my Aliexpress 14000K 70W indium lamp, except that your spectroscope unfortunately don't resolves the self-reversed dark line of the indium line.
I would expect the dysprosium also have liner rich spectrum in the NIR.
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« Last Edit: July 05, 2025, 08:35:50 AM by dor123 »
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RRK
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| HP320 is a spectrometer not spectroscope, as it outputs a *calibrated* spectrum and this differentiates it from DVD based toys.
No, Dy / or Dy based rare-earth mixes radiate more selective at visible wavelengths, and this among other things makes them more efficient in MH lamps for general lighting. Here is an example.
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dor123
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| Ahh. I didn't noticed this. But usually when referring to emission of an element into the IR, I used to referring to spectral lines there, like in the case of Xenon in Short-arc xenon lamps, or Thorium halide, which also have spectral lines in the IR as well.
And I didn't noticed that I wrote "Spectroscope" in my former comment. Will correct this.
But there is another disadvantage that I don't know why it exist: Why short-arc indium lamps have very short life?
And the fact that the spectrometer needs to be calibrated, makes it hard to use, as if I would buy one of the cheap Aliexpress spectrometers that connects to the smartphones or to the computer, I don't know how to calibrate them.
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« Last Edit: July 05, 2025, 08:37:52 AM by 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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