Osram 400w Powerstar HQI-BT/D Pro
1 x 400w Osram PowerStar HQI-BT Pro tubular quartz metal halide lamp in daylight colour.
These lamps are nice and bright and have very good CRI!
The bulged outer envelope was to solve a problem where the glass could soften and "suck in" when burned horizontally.

Looking at the datasheets, the only difference between this lamp and the non Pro version is a slight increase in lifespan to 16,000 hours from 12,000 hours and the removal of any mention of running these lamps on MBF gear.
It lists the data for running on SON gear only. There is also a slight change in CCT.

16,000h
34,000lm
5500k @ 92%

Non Pro lamp:
[url]http://80.229.24.59:9232/gallery/displayimage.php?pid=3518[/url]

Osram 400w Powerstar HQI-BT/D Pro

1 x 400w Osram PowerStar HQI-BT Pro tubular quartz metal halide lamp in daylight colour.
These lamps are nice and bright and have very good CRI!
The bulged outer envelope was to solve a problem where the glass could soften and "suck in" when burned horizontally.

Looking at the datasheets, the only difference between this lamp and the non Pro version is a slight increase in lifespan to 16,000 hours from 12,000 hours and the removal of any mention of running these lamps on MBF gear.
It lists the data for running on SON gear only. There is also a slight change in CCT.

16,000h
34,000lm
5500k @ 92%

Non Pro lamp:
http://80.229.24.59:9232/gallery/displayimage.php?pid=3518

387A7188.JPG 387A7011.JPG 387A7004.JPG 387A7137.JPG 387A7153.JPG
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Filename:387A7004.JPG
Album name:FrontSideBus / HID: Metal Halide
Filesize:8140 KiB
Date added:30 May, 2026
Dimensions:3072 x 2048 pixels
Displayed:27 times
URL:http://80.229.24.59:9232/gallery/displayimage.php?pid=25034
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AngryHorse   [30 May, 2026 at 07:02 PM]
Wasn’t aware that Slovakia were doing the halides too? Cool

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