[Reference] Nichia E17A/E21A (2000K - 6500K, R9050/R9080, color) CCT and tint shots

Thanks I didn’t know about that. CCT in those tests are fairly steady but how is it measured?

In Maukka’s review of the KR4 here: Review: Noctigon KR4 (18650, 4xE21A 5000K, CRI96) the 5000K model shifted quite a bit from lowest power to highest power setting.

I don’t know what to make of it.

The MCPCB in the KR4 is not nearly as good as the Virence ones, thus the LEDs heat more and there is more tint shift.

https://www.andwinmcpcb.com/sinkpad-pcb/ :wink:

These are DTP MCPCBs, E21A/E17A don’t have a thermal pad so you can’t use those (unless you have a grounded cathode driver and DTP the cathode but that’s a special case and even then only one side will have good thermals). They have a poor thermal conductivity dielectric layer and will perform badly. Virence’s MCPCBs have a very thin (relatively) high conductivity dielectric layer.

Edit : new ones even have 3oz copper pours ! https://www.eurekatronix.com/product-page/er10s1-21

I’m pretty sure they can make same or better MCPCB.

Yes they can do similar non DTP MCPCBs, up to 8W/m.K dielectric (they don’t detail the thickness) and apparently up to 3oz copper pours. Must be very expensive though.

Does anybody have a copy of Maukka’s table with all the measurements ? it’s not accessible anymore, I’m pretty sure I had it saved for offline use and yet I can’t find it in my Gdrive : This one

He hasn’t been connected for 10 months, I hope he’s well and just has other interests. Has anybody got in contact with him since then ?

is this the info you are looking for?

No I’m talking about the Google spreadsheet which has more data.

agree the spreadsheet is gone
this post has all the individual data though

maybe that can help you find the data youre looking for. (what data are you seeking?)

Damn. I thought I had a copy of it but can’t find it. A ‘take-out’ version might be on my other encrypted drive partition that I seem to have forgotten the password too :person_facepalming:

we build grow lightstrips with the Opti 5k and 2k to get 99+ CRI, im guessing we could shorten up the duv with more 2k
Parameter Value
CCT 4615 K
Duv –0.0016
CRI (Ra)(R1~R8) 99
CRI (Re) (R1-R15) 98
CQS 99
TLCI (Qa) 98
GAI 89
TM-30-15 Rf 98
TM-30-15 Rg 100
We are more interested in replicating sunlight than delta’s but an interesting discussion
cheers

How do you replicate sunlight with the opti? Don’t you need UV range in order for plants to grow?

Did you ever happen to find a copy of that spreadsheet?

This might be what you’re looking for

It was asking me to give someone permission and I think I fixed that issue.

Something I’ve been wondering about…

A tint mix will result lower R9, looking at the extreme example for 6500k+2000k you can see a big peak in the red part of the spectrum.

I think that the low R9 you encounter in single LEDs would typically, if not always, be due to a dip in the red part of the spectrum because red light is least efficient to produce.

So you end up with low accuracy of red for both but with caused opposite ways.

Am I right thinking the tint mix would give over saturated reds with more ‘pop’, which some could find more subjectively pleasing despite being less accurate, just like a negative duv?

For me, tint mixing increases Rg, which makes colors more saturated. I prefer the Disney cartoon like colors.

That’s shown on the color vector graphic, nearly all colors are over saturated, including red (hue angle hin 1).

It’s easier to see on a TM-30 report with the chroma shift (saturation) bar graph and color vector graphic :

Great, thanks! No permission issues btw.

Nice, thank you.