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What is CRI and TLCI? Demystifying Lighting Metrics with the Sekonic C-800: Part 1
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- Опубліковано 14 сер 2024
- Have you ever wondered, "What is CRI?" What about TLCI?? In todays video, we dive deep into the world of lighting metrics using the remarkable Sekonic C-800 spectrometer.
Get ready to uncover how a spectrometer works, the CRI definition, along with insights into spectrum distribution, TLCI and more. We've provided practical examples to simplify each metric for you. By the end of this video you'll feel confident making informed decisions when selecting lighting fixtures for your projects.
Explore how the C800 spectrometer functions and understand why it's revolutionizing the way cinematographers and gaffers evaluate lighting. Plus, gain exclusive access to real-world comparisons between various light sources, from tungsten to LED to sodium vapor street lamps.
Part one of this series focuses on spectrum distribution, CRI, and TLCI, with part two covering TM-30, SSI, and more! So don't miss out!
A huge shoutout to Sekonic and Kayell for providing us with the C-800 and enabling this educational series.
Let's illuminate the world of lighting metrics together!
#LightingMetrics #CRI #TLCI #Sekonic #C-800
NOTE:
- I made a mistake in the video and incorrectly labelled TLMF. It stands for "Television Luminaire Matching Factor", not "Television Lighting Matching Factor" as stated in the video.
- I also wanted to note that the CRI scores are calculated using R1-R8 only and do not factor in R9-15 in the Ra value.
- You may notice some slight variations between the live recordings and the measurements from the screen capture images, which were collected separately at a later time. These minor variations are normal and within an acceptable margin.
Gear Mentioned:
▶︎▶︎ Sekonic C-800 on Amazon (affiliated): amzn.to/3xthwG9
▶︎▶︎ Calibrite (formerly X-Rite) Color Checker Classic Chart on Amazon (affiliated): amzn.to/3PLBD8W
▶︎▶︎ Amaran 200x S on Amazon (affiliated): amzn.to/3U13GUi
CONTENT:
00:00 - Introduction to Lighting Metrics
00:57 - Introduction to the Sekonic C-800
01:22 - How Does a Spectrometer Work?
03:16 - The Setup
03:57 - Spectrum Distribution
04:46 - Spectrum of a Tungsten Dedolight
05:29 - Spectrum Comparison Mode - Dedo vs Amaran
06:55 - Spectral Comparison of a Sodium Vapor Street Lamp
08:18 - What is CRI?
08:38 - CRI Explained
11:18 - CRI Comparison Mode
12:06 - TLCI Explained
13:26 - TLMF Explained
14:42 - Outro
Make sure to checkout our other videos on film lighting basics in our film lighting techniques and filmmaking tutorials playlists!
Film Lighting Techniques Playlist:
• Film Lighting Techniques
Filmmaking Tutorials Playlist:
• Filmmaking Tutorials
Gear Reviews Playlist:
• Gear Reviews
💡 Our Lighting Kit:
Amazon US Product Links (affiliated):
Aputure Amran 100D: amzn.to/3mj1Eha
Aputure Amran 200D: amzn.to/3yLqoUg
Aputure 120D II: amzn.to/3qD7zPJ
Aputure 300D: amzn.to/3EkTR8L
Aputure Amran P60c: amzn.to/3tquJdZ
Aputure MC: amzn.to/3MGS8Pe
Aputure f7: amzn.to/3yKfttY
Aputure Lightdome Mini II: amzn.to/33MyuAK
Aputure Lightdome II: amzn.to/32kPIEw
Aputure Lantern: amzn.to/3phntji
Aputure 2x Fresnel: amzn.to/3fCSQSP
Godox 95cm Umbrella Octobox: amzn.to/39kXnqh
Nanlite Forza 60B: amzn.to/3xoRMam
Nanlite Forza 300: amzn.to/3xIicW9
Nanlite FL-20G Fresnel Lens for Forza 200/300/500: amzn.to/3O68XEr
Nanlite FL-11 Fresnel Lens for Foza 60 Series: amzn.to/3NKCfZr
Lee Master Location Gel Pack: amzn.to/3e2jYtY
Avenger 40” C-Stand (standard): amzn.to/30MTBBR
Avenger 40” C-Stand (detachable leg): amzn.to/3sofra0
Matthews 40” C-Stand (sliding leg): amzn.to/3eslvq5
Matthews 20” C-Stand (sliding leg): amzn.to/3mmPaF8
Impact Heavy-Duty Air-Cushioned Light Stand (8’): amzn.to/3stAHeN
Impact Heavy-Duty Air-Cushioned Light Stand (9.5’): amzn.to/3FjvIAH
Impact Heavy-Duty Air-Cushioned Light Stand (13’): amzn.to/33N3AYZ
Kupo Folding Base Mini Stand: amzn.to/3H45m5V
Manfrotto 026 Umbrella Adapter: amzn.to/3v0AeBW
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CORRECTION NOTE:
- I made a mistake in the video and incorrectly labelled TLMF. It stands for "Television Luminaire Matching Factor", not "Television Lighting Matching Factor" as stated in the video.
- I also wanted to note that the CRI scores given by the C-800 are calculated using R1-R8 only and do not factor in R9-15 when determining in the Ra value.
Awesome video. So helpful and easy to understand ✨
Thank you! Glad you enjoyed it. Thanks for watching 😊
awesome stuff. Hope the algorithm will work on your side!
Thank you 🙏🏼
Thanks for the knowledge
You’re very welcome!
can we use gels to compensate the color loss of consumer grade >80 CRI led lights... if we are lacking orange, can we use to gel?? i want to start filmmaking, but don't have the budget or any service center for buying those high end lights... I want to use commercial light with gel... can I??
Potentially. It warrants some experimentation, I have improved the CRI (very slightly) on LED film lights with appropriate correction gels. But as there is so much difference between different household lights from different manufactures in different countries that it would be near impossible for me to give you an accurate recommendation for the lights you have access to. You would need a spectrometer like the C-800 to know, which far our prices the cost of entry level film lights.
One thing to note about gels, is they don’t add a color to a light, they block certain wavelengths of a light, except for the desired wavelengths. So a blue gel isn’t adding blue, it’s blocking everything but blue. If there is very little blue wavelength to begin with (eg the streetlamp discussed in the video) it would block the majority of the output and only allow a small amount of light would make it through, which isn’t very efficient.
I will experiment with some household LED fixtures here to see if I can improve them at all, but I expect the change to be small.
If you’re on a budget, the best thing to do is find some inexpensive tungsten halogen lights (they make in hardware store halogen work lights), and use full ctb to gel it to match daylight. This is how I started!
Inexpensive, very hot, not very efficient, but they give excellent color rendering for an affordable price.
I have a video called “working with tungsten film lights” you should check out! All the principals apply to any hardware store halogen light.
@@CreativePathFilms thats exactly what i wanted to know about... if a particular color is low in the spectrum... and if I reduce all other colors to that level, I thought it will equal the reading of all other colors... ofcourse, will have to compromise some intensity in the process, but getting a 50-100w led might solve this problem... and 2nd thing please also try with bouncing the light on unbleached muslin... it works for me, but I don't have a light meter, so cant actually know the readings... 6500k led battan light when I bounced on a unbleached muslin cloth, the light fallout on the skin looked decent in the footage, that looked good actually... no green cast or any other funny light cast which we normally get with low CRI lights... and for the part you mentioned about tungsten, my 1st project is majorly based in the jungle, so there will be no power to plug... i have to rely on batteries... that's why I asked if commercial low-wattage lights can work with tweaks...
Excellent series. Could you have a general description of what a specific indicator is used for - what is the problem that is being solved before showing the tool.
Hi Johan, thank you for your compliments! Could you please elaborate on your comment further? Are you referring to the indexes mentioned in the video? Or the conversation above 👆🏼
@@CreativePathFilms the readings in general - I’m coming from a still photo background and don’t know anything about making videos & movies. In general I use a sekonic 785 for my light and a colour checker for my colours and WB - very informative series and you have a solid way of explaining