dor123
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| I bought a new 6500K 70W MH lamp for my tracklight several weeks ago, and its DyI emission is very weak, even today. And no, it have a good amount of halides inside and large enough heat reflective coatings at the arctube ends, and operates on an electronic HID ballast.
Why the DyI in my lamp is so weak?
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Laurens
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| How do you decide what's weak?
Did you let it run for 100 hours before taking your first spectrum? The first 100 hours are not representative for what a discharge lamp should look like. It has to age 100 hours first, because in the first 100 it ages rapidly after which it stabilizes for thousands of hours.
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dor123
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| I bet the lamp run more than 100 hours. I received the lamp at 20.12.2025.
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« Last Edit: December 31, 2025, 09:25:57 PM 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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| So you wanted a 6500K lamp and Chinese bro's supplied you with Dy-Tl lamp accordingly, okay. ) Tl line is always very prominent in these, as it is essentially monochromatic even at high arc loadings. It may look bright on the spectrum, but overall energy is limited as the width is still very narrow.
If checked with a calibrated spectrometer the lamp will show the color on CIE1931 XY space goes too much high to the green, we may speculate the lamp is improperly dosed or runs too cold (due to a leak to outer bulb, just badly made etc).
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dor123
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| There is no thallium in the spectrum. Only mercury and dysprosium. The green line is of mercury.
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« Last Edit: January 01, 2026, 07:20:14 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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| How do you know this? Tl 535nm is rather close to Hg 546nm, hard to tell on uncalibrated spectrum. One way to tell is to look at run-up. At start, only four Hg lines present, as the burner heats, nearby Tl green line appears, and later usually over-dominates green Hg line.
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dor123
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| No thallium appears when I see the spectrum of this lamp run-up. Also, the yellow doublet and blue line of mercury are also strong.
Also: The lamp would be greenish if thallium would be present, and it isn't the case.
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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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Also @RRK: The vacuum solid state getter is intact. I don't see any problem with it. |
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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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| It is impossible to tell any further without having the lamp in hands and measuring it with a calibrated spectrometer. Leak does not show up immediately, sometimes blue/yellow oxidation on the internal leads may be visible (though, some OK lamps show this too, air remaining at processing probably) and lamp burning voltage may be abnormal.
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James
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| Dy emission is usually proportional to the CsI dose. Cs does not really participate in the discharge but it causes arc fattening which brings the plasma closer to the lower wall, raises the salt temperature, and vaporises more DyI3 into the plasma. Not all smaller Chinese lamp producers may fully understand this interaction.
The arc here looks pretty constricted and curved, so I guess not enough CsI.
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