Measuring Light Quality - CRI or TLCI?
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- čas přidán 7. 09. 2024
- One important aspect of determining the quality of a light source is determining its ability to accurately reproduce colors. Especially with LED lighting becoming more popular, it is important to check the color quality of lights to avoid color casts in your footage. Traditionally this has been measured using CRI, or Color Rendering Index, but is this truly the measurement we should be using?
Recently I learned that there is a more accurate, and perhaps more important, measurement for light quality as it pertains to video use. This is called TLCI, or the Television Lighting Consistency Index. This measurement more accurately measures the color accuracy of lights as viewed by cameras. This is the more important measurement for video production purposes.
For more information on TLCI and what the ratings mean, please take a look at this article:
www.gtc.org.uk/...
Loved your video - very simple and clear and demonstrative. Also, your voice radiated to my ears patience and a strong will to help people. Thanks!!
The best video about CRI and TLCI !
Great information and tests ! Thank you !
The Aputure has a green tint of halo on the edge? Anyone notice?
Hey Bart - although I'm a photographer, I actually came here to look at measuring CRI for home lighting. There's a proliferation of cheap LED products on the market and it's hard to push through the lies upon which many manufacturers base their sales! (even some of the more expensive brands inflate CRI measurements...) So I was considering getting a CRI meter of some kind. I didn't know about TLCI and although your vid wasn't supposed to give techie information about what the actual difference is, thanks for doing the video otherwise I'd never have encountered it! Now off to do some more research... greetings from London UK
Awesome! Glad I could help!
Great info
same problem when you are shooting and comparing todays LED light based tvs to Plasma tvs or CRT.
massive difference in how whites looks on the camera.
and also how whites looks to our eyes.
i have ordered the UPRTEK MK350S premium
i hope i can sort this mess out with either CRI or TLCI measurements of the tvs.
as Plasma tvs are using natural glowing light i asume CRI will be close to 100.
Thanks guy, exactly the information I'm looking for
Glad I could help!
wow very helpful. I always thought CRI was more important.
Glad it was helpful!
Thank u
I found this video very helpful and informative, please keep up, great job indeed 👍🏼
I'm glad I could help! let me know if there is anything else I can help you understand!
thanks!
No problem!
Thank you ! Great information thank you very very much
This is exactly the info what i am looking for. Thanks!
Thank you.
Can you please give us a tests for cheap led panel lights, like this
YONGNUO YN600 Air Ultra Thin LED
I'll try to reach out to Yongnuo and see if I can get a hold of some of their lights!
Thank you again.
Really thank you for the great info. It would be great if you can share the measurement device full name there.
It is the ikan CV600
one other question
at what TLCI value can you start to see an clear whitebalance difference on the cameras compared to how the lights look irl?
also have you measured CRI on any of the monitors you use?
I am not sure actually. I would be interested in finding out. And no I haven't checked my monitors.
2:08 I disagree that CRI is how your eye sees the light and TLCI is how the camera sees the light.
TLCI is more accurate a metric for *both* cameras and eyes.
I sent your video to a friend and he was a bit confused by your oversimplification, and said I should have been looking at the CRI for the home lighting. And I don't think that's the better metric. CRI uses only 8 colors! (14 for CRIe), while the TCLI metric uses 24 sample colors. I don't think you did this on purpose but it mislead my friend that got the impression that CRI was specifically better tuned to how humans precieve light than TLCI. Also I think we should mention the TM-30 metric.
Thank you for your comments! I agree this information may have been oversimplified and has not held the test of time. As I have upgraded my spectrometer and lighting testing procedure over the past few years, I have been including TM-30 and SSI scores. These weren't being talked about much when I made this particular video. Maybe I need to make an updated video about the current lighting metrics! I did a brief overview in one of my recent light reviews: czcams.com/video/xjKVrFQjBP4/video.html
@@BartJohnsonProd Thanks for the followup and the link, much appreciated!
Good job Mate!
May I ask what meter you used in the video to do the measurements? Thanks.
Of course! I used the ikan CV600. I absolutely love it. www.bhphotovideo.com/c/product/1244777-REG/ikan_cv600_chrome_view_spectrometer.html
Could it be that you're using for comparison Pixapro LED100D MKII+ ? I'm considering to buy two of them and this comparrison is not the best news for me, these lights are significantly cheaper than Aputure 120D
I'm not actually sure of the model of the light. A friend brought them in and was not happy with them, and we confirmed their poor quality during the test. I would be wary of anything that is "too good to be true"
Hey Bart thank you so much.... I'm quite scare to use led light and I still don't know in wich one i should spend my money on...
A really interesting comparison would be hmi lights vs led lights ... can you do that?
Came TV came out with some interesting product as well like the boltzen series which on paper it seems very good but I never had the chances to test them out. Have a look if you don't know them they're cheaper then aputure ...
+mat matit LED lights are becoming much more affordable for high quality these days. As long as you find quality lights, you should be just fine. I would love to test some HMI lights, I just need to get my hands on some. They are expensive even to rent. They definitely are very powerful tho. And I do know the Boltzen lights from CAME TV. We actually had them on a set the other day and did use the meter to check them. I don't recall their exact results, but they were pretty good.
thank you Bart.... I can tell that HMI are very nice especially arri sun and 575 .. I use them everytime I've got the chance .. but led are really nice to work with as they're fast and light.. thank you .. nice work
I have worked with HMI's before as well, and they are indeed incredible lighting tools. LED are great to own and use on a smaller scale. But I would definitely like to do some tests with HMI's in the future. I do know a company that makes super powerful LED fixtures. Maybe they would be interested in a test...
very informative
Wow I Found this a week after I bought that cheaper led head :( thanks for the test. Could you tell me what fresnel lens you used for the cheaper light? I got the one for Aputure and I don't think its the best fit for that light.
I'm not sure what fresnel attachment that was. The light belong to one of my friends. I will try to find out for you.
Found out which one it was. It is available on Amazon. a.co/hPSTzE5
Thank you so much!
dope
where can I get CRI meter. please recommend a brand and model.
I use the Uprtek CV600, and I was able to get it on sale. It seems to not be available anymore. Sekonik has a few, but they are all about $1000. They are not cheap!
@@BartJohnsonProd wow! White balance and colour correction is easy.
so what is the best tci or tlci? whiCH you choose?
TLCI will be a more accurate measurement of quality for use with cameras
What device are you using to measure the CR and TLCI
I use the ikan CV600 spectrometer
Thanks that is what I came for too :)
What is that meter?
It is the ikan CV600
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