dor123
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It manages to reach 3500K without sodium iodide. Only rare-earths and thallium. I know it have dysprosium and thallium, but it must have other rare-earth as there are lines in the red, orange and green that don't exists in the spectrum of the Osram HQI-BT 400W/D and the vapor itself afterglowing when turning the lamp off. Here is the spectrum: https://www.lighting-gallery.net/gallery/displayimage.php?pos=-245044 |
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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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RRK
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| What is interesting, these Iwasaki lamps (both 3000K and 3500K warm colortemps) again are having that dense red-brown vapor in the hot burner, and long green-yellow afterglow, in common with Chinese 'pink' MH and old-school tin-based lamps.
One thing to note, earlier warm Iwasaki lamps had an extra iridescent dichroic filter, to make the light of rare-earth mix warmer, but later incarnations disposed of this filter, said to have some modified chemistry. That brown wapor working as an internal warming filter? Still a mystery, what is it!
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dor123
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| Max said at the time that it is the thallium that causes this. However, judging by the spectrum of my lamp, the thallium line is too narrow to absorb the blue part of the spectrum that much, and to afterglow like that.
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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 thallium iodide vapor is colorless or near colorless at densities typical for MH lamps, and does not have any noticeable long afterglow.
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dor123
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| If you turn off a green thallium lamp, you would see a yellow vapor inside the arctube at an illuminated room.
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« Last Edit: September 26, 2024, 05:04:13 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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RRK
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| But it is just slightly yellow, no comparison with dark brown vapor in afterglow-y lamps. Also, pink lamps can not have thallium fill by definition, but too show that brown vapor.
Here is a spectrum of the afterglow I captured from Iwasaki lamp. Ignore some unevenness, and a peak at far right, it is an artifact of CCD dark current in the spectrometer, cause illumination level is *very* low. Looks mostly thermal, but with some tail into yellow.
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dor123
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You have the same 3500K rare-earths as me and Frontsidebus? P.S. @Globe Collector and @James: Can you analyze the spectrum of the vapour afterglow that RRK captured? It is also from an Iwasaki lamp. |
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« Last Edit: September 27, 2024, 10:45:19 AM by 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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RRK
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| Yes, I have this one, and also 150W 3000K SLW version of RX7s Iwasaki. If I remember right, afterglow spectrum was captured from 70W lamp, but that does not matter much, 150W behaves the same, and has about the same radiation spectrum shape when lit. Both great lamps with very nice color BTW!
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