The colour of my Osram HQI-TS 70W/WDL Excellence
It is far from halogen lamps, compared to Philips MHN-TD 70W/730 which uses the same chemistry Dy-Tl-Na, and even pre-Excellence HQI-TS 70W/WDL, which have tin instead of dysprosium.
Why?

The colour of my Osram HQI-TS 70W/WDL Excellence

It is far from halogen lamps, compared to Philips MHN-TD 70W/730 which uses the same chemistry Dy-Tl-Na, and even pre-Excellence HQI-TS 70W/WDL, which have tin instead of dysprosium.
Why?

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