High CRI... not what I expected? (Happy ending in post 118)

That is 90% the tint and/or CCT of the two lights making a difference, and the other 10% being the high cri led producing more depe reds.

CRI is such a limited way to objectively measure light quality. R9 is just a sliver of deep red taking from a broad spectrum of light— or rather one single color sample. Just because a light has -R9 on its CRI graph doesn’t mean it can’t produce any red content whatsoever.

I bet if you compared a high CRI light with amazing R9, but green tint and high CCT, and compared it to a lower CRI light with pink tint and warm tint but only so-so R9, you’d probably walk away preferring the lower CRI light.

And on the topic of CRI as a whole— it’s a subtle quality to light. It is miniscule compared to CCT and tint. The only real way to accurately qualify how CRI affects light is to pit two light sources of the same CCT and tint against each other, but with varying CRI levels.

I’m sorry honey, but the blue light made me do it! I told you to swap the lightbulbs at home!

Hey, I’m happy to report the high-CRI does seem to make for better photography! The difference is more apparent through my phone camera. Combined with the TIR optic I’m able to get some good shots for my QC dealings.

Thank you, I completley agree. That is the ONLY way to show the benefit or lack of benefit of CRI. Eliminate all the variables except CRI & let the chips fall where they fall. :wink: :white_check_mark:

CCT perception is mostly a matter of raw lux, at low lux, low cct is better.

The sheer amount of lux needed for lights over 4500k to be perceptually good renders anything over that pointless in a flashlight. 6500k is for intensely bright (500-1000 lux) corporate lighting in offices etc…

My favorite Chicken Lights have 219b sw45k, like the light in the middle:

Post photos of Your favorite Chicken Roasting Light!

The Pink Chicken looks undone!

I’ll eat the crusty cooked one on the left :slight_smile:

A lot of CRI differences come right back to preference of tint and eyesight that is able to tell the difference.
Much like the White And Gold Or Black And Blue dress thing, we all see things a little different and this is a good thing,
it is what makes us perfectly made imperfect Humans.
Peace out.

I could never understand the dress thing. Always wondered wtf’s wrong with those people who saw… whatever was the wrong color combo.

Then again, I wondered if other people saw things the way I would see things, colorwise. Eg, what if I saw a woman, and she looked normal to me, but show her to 4 other people, and they see “in their brains”, something like

instead?

The highest CRI LED (I believe) is the 6500K Nichia Optisolis. I have them in a triple S2+ and it is very unique. It has a bluish tint, like most of the cheapo flashlights that you can buy, but renders colors amazingly well. And I find it interesting that the lower CCT Optisolis LEDs actually have less CRI.

This is from the Virence/Eurekatronix website:

Pic reminds me of Rolling Stones Some Girls album art.
Both versions

I normally see four of everything--that's normal, right?--but now I'm seeing sixteen women in that pic!

All the pretty colors!

(I think I need to see my optometrist.)

Me, too. My pessimetrist is just getting me depressed.

[quote=twisted raven]

[quote=jon_slider]

This is the most important point of the discussion and I wish it was highlighted more often. CRI is a comparison to a blackbody OF THE SAME CCT. As soon as you change the CCT the comparison is largely meaningless. To say I like a high CRI 4000K over a low CRI 6500K says far more about what CCT I prefer than the CRI.

You’re welcome to disagree with every word stated, however, that doesn’t alter the fact that CRI is a comparison with a black body OF THE SAME CCT. A very warm CCT (let’s say 2700K) that has particular CRI won’t automatically render colours more accurately than a cooler CCT with a lower CRI. The CRI value is actually meaningless without knowing what the colour temp is.

I’m not saying you can’t enjoy higher CRI lights but to simply say “high CRI is the most important aspect of a light” is leaving out the more important part of the equation; what colour temperature do you like?

I’ve actually been trying to follow this thread and understand what each person is trying to say ( and by that i mean i’ve been goggling the terminology ). I’ve goggled that stuff before but it got so scientific and convoluted that i lost interest. I think i have a better understanding of bbl and duv now but i still don’t understand some people’s comments.

If i understand this correctly CRI is colour as viewed in midday sunlight? So any cct other than 5500K is just going to be …err… wrong. Before you jump on me to argue that point, I came to this resolution while researching then I found this website that said exactly that. Sure the bbl is to accurately show black … at a given temperature (high CRI). That doesn’t mean colours will show exactly as seen in sunlight or 5500 high CRI (because our eyes adjust to what they are seeing…?). On top of that we have each individuals perception of light and on top of that each has their own preference of what feel comfortable in seeing. The comment i made about our eyes adjusting is just something else on top of all the other variables.

I fall in the 8% of males with colour blindness - I see 21. Some argue that percentage should be much higher. I’ve known about this colour blindness since i was a teenager and only had 3 maybe 4 occasions in my life (45) when someone has pointed out to me that i wasn’t seeing the colour quite right. From my understanding/experience the blindness sometimes depends on the surrounding colours/light. Hence i’m half interested in the poll that BurningPlaydoh suggested.

[quote=Dickens]

[quote=twisted raven]

After looking up this stuff I think the above is the safest/best way of finding a starting point for ones personal preferences (cct) before experimenting in real world tint and CRI. From my experience - real world experimentation is key (insert specific application if needed) and i wonder how many hobbyists actually find their preference when they are comparing 5500K low CRI to 3000K high CRI.

I think we all see differences in cri regardless of colour temp or tint. Though, I think the purpose of that chook picture is an unfair comparison for the reasons mentioned by twisted raven. BTW the pink chook looks uncooked to me. Though i am interested to know why beam geometry makes a difference…? Is this related to tint shift within the beam?

I totally agree with your point. With the choice of leds available nowadays it’s (for lack of a better word) a minefield to find ones true preferences albeit just one aspect (big or small) of the hobby.

Yes, CRI is a vague objective description of how accurate a particular light is compared to an ideal black body radiant of the same CT.

As an example, one can’t just say ‘x led at 5500k with 99 R9 has more deep red output than y led at 3000k with 80 R9.’ 5500k by its nature has way less red content to it than 3000k, so an led that is 99% accurate at deep red output at 5500k might still have a fraction of the deep red output of a 3000k that is 90% accurate at deep red output.

Can you? How easily can you pick out the CRI differences in these samples, where exposure, CCT and beam geometry have been somewhat normalized? (tint differences not normalized) One LED has a CRI of 65, and the other a CRI of 80:

In this example, one led has a CRI of 99, and the other a CRI of 80:

For home use, I think CRI is probably the most important aspect of an LED light bulb.

to those who are going off into CRI theory, I think youre missing the point

I prefer the High CRI LEDs I actually have, to the Low CRI LEDs I actually have…

this is not theoretical

I KNOW I like my High CRI LEDs better than the Low CRI ones. I believe that is because my High CRI LEDs are better at showing Reds. This is not theoretical, it is my experience, and I have posted photos to demonstrate and explain. The photos were not doctored, I did not alter the image in post production in any way.

my point is, to those who choose to disagree with my opinion, post some real photos of real LEDs and demonstrate your opinion that it is not the High CRI that is making me happy. If you think it is just the tint or CCT, show pics to support your opinion.

Either way, whether the reason I prefer High CRI is due to R9, Tint, CCT, or hot spot size… there is no denying that for me, the sw45k is better than a NW Low CRI XM-L2, even when the CCT is the same…

anyway, enjoy whatever floats your boat

for those trying to wrap their head around Tint, aka DUV, aka above or below BBL… here is a visual (image thanks to maukka):

the BBL is the 0 DUV line
look how all the 219c have tint above the BBL
look at the sw45k, see that it is below the BBL, aka, has negative DUV

I do have my own color temperature preferences, but no matter what CCT, I will always choose the High CRI option with the highest R9 and the least green tint…

all the variables matter… it is not a One Variable is Most important, type of situation. But still High CRI is an absolute requirement for me. I will not trade it for CCT nor Tint. I want it all… the CCT I like, the Tint I like, AND High CRI…

I have an EagTac D25A/Nichia 219B sw45k for indoor and a TrustFire T62/XHP70/6000K IINM for outdoor with me this weekend. Both do an excellent job for what I want them.

Ha, did a medical inspection (wood splinter) with the D25A, that was so cool :+1: .

The way I understand that is cri reigns supreme and you can easily see the difference like 2-26350-P91 can. And you don’t need side by side comparisons to see the difference. So when out camping/ walking the dog or whatever a 6500K high cri is more comfortable on the eyes than a nice warm low cri.

Personally >5000K is a bit stark for me so Kelvin reigns supreme.