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The arc of my Osram HQI-TS 70W/D Excellence Notice the yellow mantle of the arc. I've never seen this before. What causes this?

The arc of my Osram HQI-TS 70W/D Excellence

Notice the yellow mantle of the arc. I've never seen this before. What causes this?

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Filename:IMG_1520.JPG
Album name:dor123 / Lamps
Filesize:542 KiB
Date added:29 Jul, 2026
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AngryHorse   [09 Aug, 2026 at 07:38 PM]
Could be from the electrodes?, I know these Excelence lamps run the electrodes hot?
dor123   [09 Aug, 2026 at 07:44 PM]
You can see that the outer mantle of the arc itself if yellow rather than red. This have not to do with the electrodes.

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