dor123
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| I replaced my Electra rebranded Venture MH-DE 70W/UVS/4K to my Osram HQI-TS 70W/WDL Excellence, in order to get a warm light during the cold winter, and got noticed that the light is much dimmer with the Osram than with the Venture.
The Osram uses cerium, thallium, sodium + lithium as an impurity from the quartz, and the Electra rebranded Venture MH-DE 70W/UVS/4K, have sodium and scandium. Both chemistry are known for their high efficiency.
Why this is occuring?
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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.
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I lives in Israel, which is a 220-240V, 50hz country.
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HomeBrewLamps
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| Maybe the outer envelope lost vacuum and it doesn't have proper thermal insulation?
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~Owen
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dor123
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| The outerbulb looks fine. Osram HQI-TS 70W/WDL Excellence from Germany, are durable lamps. The Osram have 5925lm rated, and the Venture have 5500lm @ 100 hours, and it is passed this mark, as it was used a lot.
Also: Without a vacuum in the outerbulb, the Osram lamp won't start, since it don't have Kr-85 in the arctube, and the coronal wire won't be functional.
I would expect that the chemistry of the Osram lamp (Ce-Tl-Na-Li), would give similar lumens to the Venture lamp (Na-Sc), as cerium is used in the Philips Cosmopolis, and in lots of high efficiency CMH lamps. Otherwise, why CMH lamps don't contains Na-Sc?
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« Last Edit: November 21, 2019, 01:32:45 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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Max
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| I had a similar issue with this lamp several years ago: the color was off and the light output was too low. It turns out that the IBL electronic ballast that I used drove the lamp at a too low wattage, i.e. 71 W vs. the needed 78 W. I think that you have a similar issue with your system. I suspect that Osram optimized its HQI-TS Excellence lamps for an operation on inductor ballasts.
By the way, where did you get the lamp's chemistry from? I was not aware it contained cerium. I'll look into its spectrum to find evidence of that.
"Otherwise, why CMH lamps don't contains Na-Sc?" - because scandium is too chemically active compared to rare-earth elements, and the performances of arcs burning in scandium-based fill chemistrys do not improve as dramatically as those of dysprosium-based chemistries at the higher operating temperatures of ceramic burners.
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dor123
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| I think I'm heard from one of the members here, that the Osram Excellence chemistry is based of Cerium.
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Logged
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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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