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Light color check of clear mercury vs. underdriven HPI The picture above shows the aspect of a ColorChecker under white light (left, reference), clear mercury light (center) and the light from a HPI-T Plus 250W run at 185 W (right, see [url=https://trad-lighting.net/gallery/displayimage.php?pid=1434]there[/url]). Although the HPI emulates the light of the clear mercury lamp very effectively, we can see the effect of the longer wavelengths of the sodium lines and the weak emission in the red from the lithium impurity. [url=https://trad-lighting.net/gallery/displayimage.php?pid=1438]Reducing further[/url] the power input of the HPI takes care of that though. Keywords: Miscellaneous

Light color check of clear mercury vs. underdriven HPI


The picture above shows the aspect of a ColorChecker under white light (left, reference), clear mercury light (center) and the light from a HPI-T Plus 250W run at 185 W (right, see there). Although the HPI emulates the light of the clear mercury lamp very effectively, we can see the effect of the longer wavelengths of the sodium lines and the weak emission in the red from the lithium impurity. Reducing further the power input of the HPI takes care of that though.
GE-MML-55W-_7906.jpg Photo_045.jpg DSC_2299m.jpg DSC_2302m.jpg DSC_2309m.jpg
File information
Filename:DSC_2302m.jpg
Album name:Max / Misc lamps and lighting
Keywords:Miscellaneous
Filesize:937 KiB
Date added:31 Oct 2026
Dimensions:1500 x 831 pixels
Displayed:44 times
DateTime Original:2026:10:25 14:23:28
Exposure Time:1/80 sec
FNumber:f/4.5
File Source:Digital Still Camera
Flash:No Flash
Focal length:75 mm
ISO:100
Model:NIKON Z 6_2
Software:Adobe Photoshop 25.7 (Windows)
White Balance:1
URL:https://trad-lighting.net/gallery/displayimage.php?pid=1439
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Comment 1 to 8 of 8
Page: 1

Drew   [Sat 31 Oct 2026 at 18:55]
Wow that's an excellent result, I certainly wouldn't be able to tell! Does this reduce lifespan? I hear MHs are more sensitive to this but that does look very nice
Sammi   [Sun 01 Nov 2026 at 00:03]
What a fascinating comparison.! Wonder Mind Blown
Ria   [Sun 01 Nov 2026 at 00:05]
That ColorChecker looks interesting, how would I go about getting one..?
Drew   [Sun 01 Nov 2026 at 00:57]
I was looking into that too, they look to be decently expensive! I suppose the colors must all be nonfluorescent, and maybe made of single pigments instead of a cmyk mixture but who knows.
Ria   [Sun 01 Nov 2026 at 16:58]
Yes, after I typed the above, I looked them up myself and they are indeed frighteningly pricey Mind Blown
Sammi   [Sun 01 Nov 2026 at 19:24]
@Drew, I would have said they were indecently expensive.! Mind Blown
Ria   [Sun 01 Nov 2026 at 19:31]
That's one word for it Razz
Max   [Tue 03 Nov 2026 at 07:32]
Those ColorCheckers have certainly become really expensive in the last couple of years. Inflation has spared no goods and items I'm afraid.

Drew - The light color emulation is excellent, but looking at your skin under the HPI light you can see that the CRI is clearly better. Nevertheless, it's good enough for all intent and purposes.

Comment 1 to 8 of 8
Page: 1