dor123
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| The problem is that this spectrometer have low spectra resolution, as it show narrow lines as wide, and makes hard to resolve every line in the spectrum.
I'm also fear that I don't know how to use a spectrometer.
But it definitely looks that a tin was used as a filter for the blue wavelengths.
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« Last Edit: May 08, 2025, 05:28:47 AM by dor123 »
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RRK
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I am open to anyone who will sponsor me buying $1000 1nm real resolution ocean optics heh  Dor, it is simple to use a spectrometer. (1) power on (2) point to the light source (3) push the button, push the button! |
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dor123
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| But it needs to be calibrated and the spectra to be aligned and etc... And this is hard to me.
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I lives in Israel, which is a 220-240V, 50hz country.
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dor123
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| But I think neodymium is still exists in the arctube to bring the CRI to Ra96, while other daylight rare-earths have lower CRI than this.
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RRK
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Any confirmation on Nd usage, patent, technical manual, etc? Or is it just a fantasy? Nd is relatively weak in red. https://atomic-spectra.net/spectrum.php?elem=NdWhat is the reason to add it? Modern CMH use Ca and Tm to enrich deep red area. |
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James
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| In terms of what fill components Iwasaki was using, I know this only for this SDW type (Ra96 3500K) and for the D type (Ra96 6500K). The former is based on DyTlCs iodides + dichroic filter, whereas the latter comprises DyNdCs iodides without filter. No trace of tin was detected, so it would seem that the DyTlCs vapour is also capable of emitting an afterglow similar to tin.
I have not analysed the chemical fill myself, but in the library at work we have a lot of internal reports from the old Osram Berlin lab and they tore down several of these Iwasaki lamps to analyse every aspect of their construction and raw materials. The halide doses were worked out the standard way by dissolving the known volume of salts in the arc tube, and running the solution through the plasma torch of an ICP-MS.
I should have done this myself for the SD type (4500K) to complete the study, but recently my ICP was been thrown away due to lack of use and because it really took up a lot of space in our lab, so I guess that one will remain a mystery!
Incidentally, the above analysis identified that these lamps have an unusual ignition aid in the arc tube. Rather than using the standard thoriated cathodes or adding a radioactive Kr-85 component to the gas filling, they contain a tiny ceramic pellet doped with Promethium-147!
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dor123
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@James: The thallium exists also in the 3500K version, according to the spectrum of my lamp, so it is Dy-Tl-Nd-Cs. But if cesium exists, why the arc of my lamp is so constricted.
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RRK
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| But...
It is all strange. Dy-Tl-Cs mixes are usually known for 6000K radiation in Osram /D lamps, daylight BLVs, GEs and their Chinese imitations. To filter out blue part and tune the color to 3500K with a dichroic filter will mean a huge efficiecy loss...
Newer 3500K Iwasaki lamps like one on my colection seems to have just translucent burners and outer tubes, no dichroic coating noticed. But how then they managed to get 3000-3500K from Dy-Tl-Cs?
And Dy-Tl-Cs mix never showed any noticeable afterglow in any other lamps, Osrams and clones.
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dor123
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@James: And how the 6500K version reach Ra96 from Dy-Tl-Cs only? Other daylight rare-earths based on this chemistry, have lower CRI like the Osram HQI-BT 400W/D and its clones. It should have neodymium as well. Looks like in the 3500K version, tin or other halide, filters the blue part of the spectrum to lower the CCT, and it also have brown vapor and afterglow.
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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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dor123
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Update: @RRK and @James: The thin arc of my lamp became unstable. It sometimes slightly moving and flickering. I can't capture this with my camera, because the tracklight must point down to ensure the tip at the top. I doubt if the arctube have cesium at all. |
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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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