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Hello everybody,
Would there be a way to use displaycal + i1 display pro plus to calibrate led lights? I’ve bought philips led lights of which you can change the color temp. I want to calibrate them to 6500K, so I would only need to measure the white balance. I already tried starting a regular calibration and aiming the i1 display pro at the lights, but with no result. Thanks in advance.
Calibrite Display Plus HL on Amazon Calibrite Display Pro HL on Amazon
Disclosure: As an Amazon Associate I earn from qualifying purchases.It would be best to measure with the diffuser over the sensor in a dark room with no other illumination. Since the interactive display adjustment step requires that you remove the diffuser it can’t be used.
You could use the ambient light measurement on the calibration tab to get the color temp.
Or you could just open a terminal window and go to the ArgyllCMS directory and run spotread with the -a flag which will give you the same information printed out in the terminal.
Yes, simply unzip Argyll from official page to C:, open terminal, go to executables folder “cd C:\Argyll_V2.3.0\bin” and run “spotraed -a -T”, this will show you color temperature. However, bulb tuned to 6500K may not be equal to display 6500K due to different spectrum. I have Medialight 6500K CRI 98 bulb and the effect has disappointed me: neither display, nor prints don’t look as lighted by/with 6500K sunl;ight. Eve high-CRI LEDs don’t have purple part of spectrum, most of high-CRI LEDs don’t have violet part, others may have too intense violet, all bulbs have some fall in cyan which is primary color in press. But the idea of RGB bulb tuning is interesting cause this bulb may be close to good display spectrum (see Samsung quantum LED spectrum in colorimeter corrections). I’m looking for Philips bulb spectrum (“spotraed -a -T -S”), but you can’t measure bulb spectrum with colorimeter.
If it is a RGB bulb you’ll need a CCSS fro an i1d3, otherwise you’ll need an spectrophotometer.
Also getting some color coordinate in the light from bulb nothing to the quality of light being reflected by objects. You’ll need that such bulb in seraint CCT configuration had a spectral power distribution close to some natural or thermal light source at that CCT. Normlicht had on of these leds with 7 or 8 leds.
Thanks a lot everybody for the feedback, I totally forgot about the ambient light sensor! I don’t like the result, as it very obviously lacks in some part of the color spectrum. I’m going to return it and get something better, I was looking at the medialight bulbs, but as a user stated above it wasn’t that good… Any other suggestions? I’m based in Europe if that helps
More oriented to filming but there are some T8 tubes, bulbs and stanalone led modules & reels:
Complete LED Color Rendering Database of 2018: CRI, TLCI, CQS, TM30-15
INDK which are customizable.+
https://www.just-normlicht.com/en/articlelist.html?id=85&name=DLS-moduLight+
AFAIK Yuji has no 6500K bulbs:
High CRI LED Bulbs
only modules & tubes:
YujiLights™ Full Spectrum CRI 98 D65 6500K T8 LED Tube for Color Inspection – Pack: 3pcs
YUJILEDS® High CRI 95+ 2-in-1 Tunable 100W LED Module – Pack: 2pcs/4pcsVery difficult to get a good cool light source (>5600k) with LEDs without those huge spikes in blue
Thanks for the feedback! Those seem like very good options. I’ve done some research myself aswell and I’ve come across this: Activa T8 | Sylvania Lighting Solutions (sylvania-lighting.com) Cri 98 Ra, 6500K, claimed full spectrum. What do you think, judging from the picture I attached, will this be good aswell?
Nevermind, I totally misread the chart. It’s trash.
It’s a typical CCFL. If you integrate it over std observer measured with a 10nm spectrophotometer huge CCFL spikes will fade BUT these spikes may alter some colors or maximize the differences between you and std observer.
I cannot integrate it visually, so IDNK if I skip CCFL spikes it will mach a daylight or thermal spectral power distribution.Nevermind, I totally misread the chart. It’s trash.
if I skip CCFL spikes it will mach a daylight or thermal spectral power distribution
Yes, Sylvania CCFL is D50 simulator and is reference for production print check. These lights are still in use cause LEDs still have lack of purple spectrum part and have fall in cyan. I wondered when turned on Medialight Mk.2 D6500 CRI 98 bulb: print view appeared much different to daylight, close to lighted by WLED, while measured bulb spectrum really covers most part of visible light. But using Sylvania for computer workplace lighting is bad idea, I suppose, here will be metamerism effect. As well as home lights, CCFLs are generally bad for eyes.
Also worth mentioning is that Phillips, Osram/Ledvance (and other LED companies) post their SPD graphs on their website datasheets. Check them for spiky reds (a bad thing).
Next, look for a high 90+ CRI. Professional lighting online retailers will let you sort by CRI score. The one I use puts “best colour rendering” in the product titles.
If it has a high CRI rating + no spikes in the SPD = it’s perfect.
With this method you can find brilliant 2700K to 4000K lights for just $5-10. These colour temperatures are perfect for print and photography. And don’t bother with 6500K unless it’s for bias lighting.
