I usually use this diagram.

or

I use the first one from Celery.

Except CR is just as important.

I know 2700-3000 skews a little yellow. I don't care, its comforting. And yes Color Rendering Index is important. You can have a 4000 with a CRI below 80 which means it makes colors look lousy anyway.

Yes. I found the article referenced at the top both entertaining and enlightening!

Link to article
https://nymag.com/strategist/article/led-light-bulbs-investigation.html

I have a mix of 3000k and 3500k bulbs in my house and the light is nowhere as orange as Celery’s photo shows.

I changed all my lighting to daylight (5000K range) LED bulbs approx 7 years ago. The kitchen overhead fluorescent fixture was recently changed to an LED panel with three temp settings. I once in a while flip it off/on too quickly which triggers a change and I have to cycle through the choices to reset it. The yellow/orange of 3000K is icky in comparison.

I love 4000K LEd lighting and now happily I have changed all my bulbs to it. It makes me feel happy on a cloudy day to have the feel of bright sunlight. I never like incandescent so we had all Halogen before . IMO colors stay true with 4000K Some ideas on restrictions make sense I for one love the savings I get from switching to all LEDs my electric bill went down almost 15% whats not to love.

What's not to love is that I hate the light effect. And why don't I get a CHOICE!!!???? Isn't choice one of the big deals on another topic that won't be named here????

And when science convinces the government that LED lighting is harming our retinas maybe then they'll come to their senses. Or maybe not.

The article states that the average family will save $225 annually. Really? BFD. I'll pay the extra $225 to have the lighting that I WANT.

Not all change is for the better. Remember CFLs?

Yes - and that's why no one uses them anymore and advancements in LED technology accelerated...............

I just switched my bulbs to ones that have a circadian schedule and I LOVE it! 2700K in the mornings, brightens to 5500K over the course of the day, then back down to 2700K in the evenings. I find 3000K during the day to be depressing and 4000K at night to be jarring, so I love the ability to have it change.

@just_janni and I'm betting that the same thing will happen to LEDs once it's proven that they are harmful to our health.

CRI only rates the accuracy of 8 pastel colors and omits the 9th which is red so it’s not much help in finding good lighting.

Not a chance LED's are going anywhere. They are too efficient. Like cell phones that are shown to cause acoustic neuromas, little tumors around the ear, they are here to stay.

Thanks for sharing! It's always fascinating to learn about the science behind lighting and color temperature, especially since it can have such a big impact on our moods and productivity. By the way, if you're also into literature, have you checked out some of the best literary magazines out there? They can be a great way to discover new authors and styles of writing that you might not have encountered otherwise. Let me know if you want any recommendations!

The Color Rendering Index (CRI) is made up of 8 pastel colors, R1 to R8. For natural rendering of the color red (R9 in the extended CRI) the R9 rating should be greater than 50 with 90 being desirable. Many LED's have an R9 rating below zero.

Since most LED lamp manufacturers don't publish that information or use an extended CRI, you should look for "California Title 24 compliant" in their specifications, call the manufacturer or look for "JA8-2016" on the device which indicates it conforms to Joint Appendix 8 of California's Title 24 that governs lighting in new residential construction as follows (in part):

• CRI greater than 90

• CCT under 4000K

• R9 greater than 50

• rated life greater than 15000 hrs.

Should this really be so difficult?

It was much more difficult in the 60's.

@Diana Bier Interiors, LLC Better buy a container full of filament bulbs to last you for the rest of your life.

Re: the article - i've legit never seen someone have so many issues with lightbulbs. I have to assume they're only buying the cheapest stuff they can find. I'm pretty fussy about lighting, temp, CRI, etc, and while i've seen some awful strobing in bulbs at friends' places, I've never experienced it with bulbs that I've purchased, and outside of the first few years we switched to LED and didn't have LED dimmers installed, haven't seen it at home.

I personally think that integrated LED fixtures are a scourge - they require that you replace the entire fixture when the LED inevitably fails (and some of these are spendy fixtures), or in the case of something like can lights, you can't replace just one, because then you're dealing with a situation like the author described that the Met - not quite matching. But having the option of something like a standardized e26 base allows for the user to decide what temp and light quality they want.

Nothing is perfect. LED lighting, in addition to often lacking warm (red based) tones, creates dark, sharp shadows that many people find uncomfortable. It can sometimes be fixed by spacing the fixtures more closely

https://www.wavelengthlighting.com/blog/2018/9/10/the-led-dark-shadow-problem-a-solution-for-retail-and-gallery-environments