Light Bulb CRI_Grades

Is the point to point out which lights have high R9?

TMI-30 includes additional output for situational measurement such as skin tones. Besides R9 not existing in TM-30 or CQS Wouldn’t it be better to base our BLF database on a more updated methodology?

I like the TM-30 diagrams (picture form), but the Rf and Rg it get summarized into are so in-sensitive I don’t find them very useful.

fneuf, can you please add a CRI_Grade column to your data so we can see how it performs?

The only one higher than 3000K is a 5000K bulb in a flexible neck overhead light above my desk. Differences in temp are far less annoying than tint/duv to me, I don’t mind using 2700K lighting indoors on a cloudy (>6000K sunlight) day.

Ick. Do you know what they are or where you bought them? I’m wondering who sells junk like that in 2019.

Sunlight covers nearly all CCTs, it just depends on the hour of the day and atmospheric conditions. On a clear day at dawn or sunset ≈3000K, ≈3500K one hour before sunset, etc.

I particularly tend to go for warm or neutral CCTs, and I think I'm not bothered by green tints too much because I have a custom lamp built with 4000K CRI90+ LH351Ds (from first AEDe group buy batches, T6/T7), considered greeny by others, and I'm fine with it.

Huh? I purposely bought the 5000K from Waveform to have neutral white work area lighting I can use when I want something closer to sunlight.

“Junk” is a strong word tbh.

I think there is a chart that suggests how people reacts towards light with different CCTs and intensities.

At least, right up until 6500k, the higher the intensities the higher the CCTs should be or the light feels “too hot”. The reverse is also true, the higher the CCT, the higher the intensities should be, lest the lights looks too cold and depressing.

Well, yeah it’s the Kruithof curve. You need at least 300 lux of the light to make 5000k looks somewhat pleasant. According to this theory, if you feel the light looks too cold, you need to add more light to it. On the other hand, if you don’t need any more brightness, you would then need to swap it with a “warmer” lights.

I must have misread your post. I understood your bulbs had a strong green tint. It reminded me of the green light bulbs my grandparents have. It’s hard to focus on the conversation when all you can thing is “turn it off! turn it off!”.

Not after you see it.

I live where 765 fluorescent lights are the standard, 865 is sold as a “premium” product. 840/830’s are a rare find where the 640/530 fluorescents are everywhere. If I buy the warm white fluorescents in the supermarkets nearby, I will most likely get ones with only 50 CRI. :person_facepalming:

Pretty much anything should be an upgrade I guess (as long as the tint is not outright terrible).

I'm totally happy if we can advance together on a perfect way to compare bulbs. And as such your dedicated topic on a grade is interesting. It's just that if we have two separate tables on BLF for the same subject, with the same meaning, quite very probably the same bulbs, but just using a different ordering formula, it will mainly be confusing. And in the overall both of us will loose time maintining those, members will not know where to declare new bulbs/tests, nobody we'll be sure what's the latest, and so on. Everybody will loose energy, readers will loose exhaustivity, etc.

So if we can converge on something built together that will be perfect. For instance if you feel it, I'd be glad to grant you update rights on the sheet document initiated in the other topic. And you can add there the CRI_grade, bulbs, or whatnot. I'm sincerely opened.

My intent here is to build something greater apon all our motivations, ensure we don't "spoil ressources." I'm convinced we can build something great together for BLF, by joining efforts.

Nearly all of the lights in our house are GU10. I’ve got Soraa Vivids in a few critical locations. They fantastic and reliable but they are £29 each

Soraa Vivid is CRI 95, R9/95, Rf/90, Rg/100 7.5 and 435lm but £29 each. Soraa also have a 9W 490lm version at £32 each.

Philips Master Expert Colour 5.5W 3000k Order Code 70769200 are much better value for money. They are £8.30 each,

CRI 97 375lm 800cd. Philips do not specifiy R9, Rf or Rg but they give us a graph:

I originally created my table for personal use. To sort in interesting new finds on the internet against the 40 some meter readings I had from around my house. It worked so good I wanted to share it.
I’m sorry you feel that way, I don’t see it as a competition. Hopefully we can get them both into the same table and continue the discussion.

Wow, that’s like $37 USD per bulb! And this is the first time I seen a company smooth a TM-30 diagram too, hmm. I’m glad you’re happy with them, but the missing numbers surely pull them out of the A grade category. I would recommend getting a cheaper SunLike GU10 and comparing.

Yes, those Philips Master ExpertColor bulbs are very good. Especially because they are also available with 4000K (much better for home lighting during daytime than warm white CCTs). The 4000K ones are not perfect though, they have a positive Duv and a rather tight emission angle. I added heat resistant minus-green Filters and DC-Fix diffusion foil to mine. The warm-white models probably don't need any correction.

I would say we are on the same mindset, but you might have misinterpreted the tone of my previous message.

I'm precisely proposing in it to offer you modification access to the table. Just let's do that together!

[quote=Joshk]

I think they are primarly aimed at high end retail display lighting and art galaries.

I’m not going to be buying any more Soraa Vivids unless the price comes waaaay down. They are a bit brighter than the Philips Master ExpertColor. Other than that there isn’t much difference.

I’ll see how well the Philips LEDs hold up. I’ve only had them about 6 months.

I did a quick google search and I could only find SunLike GU10s on AliExpress. It is hard to know what is fake or safe on AliExpress. A bad one could be a fire hazard, especially here in 240V land.

They seem to be made by one man alone, and he’s not on AliExpress that I know. They are hard to order, you need to use a translator on his site to order. But they are made in 240V land, so no worries.

-Adam, if you are reading this, please create an english-language thread in the Seller section so I can link to it when I talk about your bulbs.

This is his site: http://sunlikelamp.com/

I posted all of my LED strips and bulbs test results in this thread. They are mostly LED strips.

ooh, I love ambient lighting. I’ll add everything I can. I see some don’t have R12 listed though.

Unfortunately most don’t have R12 because these were tested months ago. Going forward, I will include R12 in my measurements.