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150W Powerstar Osram HQI-T Not too exciting but the only lamp I have with this type of electrode arrangement. Shown here just after ignition the UV content is seen fluorescing the outer envelope. This reduces with run up and the halides becoming active in the discharge. The spectrum for the fully heated lamp is shown in the picture insert. Lamp colour temperature is a pleasant warm 3000K. Keywords: Lamps

150W Powerstar

Osram HQI-T Not too exciting but the only lamp I have with this type of electrode arrangement. Shown here just after ignition the UV content is seen fluorescing the outer envelope. This reduces with run up and the halides becoming active in the discharge. The spectrum for the fully heated lamp is shown in the picture insert. Lamp colour temperature is a pleasant warm 3000K.

LL_Post-Transition_Metals.jpg Philips_LL93146E_HgCdZn_-_NL_1972_a_m.jpg HQI_spect.jpg KR-H39-22KB-37.jpg VLI-MH1500-U-BT37-1_0.jpg
Lamp/Fixture Information
Manufacturer:Osram
Model Reference:HQI-T PowerStar
Lamp
Lamp Type:Mercury-Halide
Electrical
Wattage:150W
Optical
Colour Temperature:3000K
Physical/Production
Factory Location:Slovakia
File information
Filename:HQI_spect.jpg
Album name:Tuopeek / Metal-Halide
Keywords:Lamps
Filesize:224 KiB
Date added:06 May 2026
Dimensions:1890 x 2400 pixels
Displayed:23 times
DateTime Original:2026:05:06 19:57:35
Exposure Time:1/4000 sec
FNumber:f/32
File Source:Digital Still Camera
Flash:No Flash
Focal length:42 mm
ISO:100
Model:NIKON D3400
Software:Adobe Photoshop Elements 2.0
White Balance:1
URL:https://trad-lighting.net/gallery/displayimage.php?pid=1245
Favourites:Add to Favourites

Comment 1 to 3 of 3
Page: 1

Drew   [Wed 06 May 2026 at 19:57]
I always thought these were very cool, what an interesting way to make a single ended lamp. I would assume they would be relatively easy to manufacture as well.
Max   [Wed 06 May 2026 at 20:28]
I disagree with your "not too exciting". That single-ended burner design is a really neat concept and a very clever approach to ensure stable light color and output over a wide range of burning positions. It's always a treat seeing these lamps, lit or not. Have you seen its glowing tin halide atmosphere after switch off? It's quite impressive!
Tuopeek   [Thu 07 May 2026 at 10:28]
It is an interesting electrode design indeed and quite fascinating that it doesn’t behave unstably, like a small ‘Jacob's Ladder’ in certain orientations. Smile
I was doubtful this lamp contained the Tin additive to the halides, but it certainly has a noticeable vapour after glow.

Comment 1 to 3 of 3
Page: 1