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

190 posts / 0 new
Last post
welight
welight's picture
Offline
Last seen: 2 weeks 6 days ago
Joined: 11/23/2013 - 17:42
Posts: 214
Location: Melbourne

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 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

Cutter Electronics Pty Ltd
Web: https://www.cutter.com.au

SKV89
Offline
Last seen: 1 hour 10 min ago
Joined: 12/10/2017 - 12:46
Posts: 4491
Location: US

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

MRThundrcleese
MRThundrcleese's picture
Offline
Last seen: 4 months 6 days ago
Joined: 02/13/2021 - 00:07
Posts: 2
Location: Southern California

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

HometownHoagie
Offline
Last seen: 2 months 3 weeks ago
Joined: 08/06/2021 - 17:56
Posts: 5
Location: Philly

This might be what you’re looking for

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

polo8
Offline
Last seen: 1 month 2 weeks ago
Joined: 01/21/2022 - 13:02
Posts: 30

maukka wrote:
CRI data for all the emitters and some tint mixes. All except one mistake at 700mA per emitter.

2000K
2200K
2700K
3000K
3500K
4000K
4500K
5000K
5700K
6500K

2000+3000K
3000+4000K
3000+4500K
3500+4500K
4000+4500K (350mA per emitter, oops)
4000+5000K
4000+5700K
2000+6500K


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?

SKV89
Offline
Last seen: 1 hour 10 min ago
Joined: 12/10/2017 - 12:46
Posts: 4491
Location: US

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

thefreeman
thefreeman's picture
Offline
Last seen: 9 hours 2 min ago
Joined: 01/06/2020 - 09:56
Posts: 1385
Location: France

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 :

Verodin
Offline
Last seen: 53 min 24 sec ago
Joined: 01/11/2022 - 16:50
Posts: 568

HometownHoagie wrote:
This might be what you’re looking for

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


Great, thanks! No permission issues btw.
thefreeman
thefreeman's picture
Offline
Last seen: 9 hours 2 min ago
Joined: 01/06/2020 - 09:56
Posts: 1385
Location: France

HometownHoagie wrote:
This might be what you’re looking for

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

Nice, thank you.

Pages