Id expect them to offer a bit less ppf/w than a standard 4000k 80cri. High cri red phosphors are generally less ppf-efficient than than standard phosphors.
I dont really think these chips have a much lower blue level than standard 4000k i think its more an effect of scaling of the image; with really sharp spikes like that on top of a standard(ish) 80 cri spectrum everything which isnt a peak looks somewhat diminished. Compare the blue peak to the green bump; youll find that they are pretty much similiar in height/intensity, just as a standard 4000k 80 cri. So the reduced blue may be a trick of the eye.
My general thinking right now for flower goes in the direction of high red, low green low blue on the main channel, then a separate channel for wide blue and uv. Maybe even far red on a separate channel. Weve got a couple of fixtures hanging now evaluating were we wanna go in the future as we need to update some lights but sadly i dont have full conclusions regarding this, need a few more grows to have a clear picture.
Right now we have GLA strips versus plain white 3000k but also in the same grow space another fixture of 2700k 90cri + 660 and a second channel of uv (2:1 400/365nm about 10 % of total draw). This light kicked out some pretty kickass weed but still not been able to compare the results with the GLA strips.
In the same space we also have another light based on a pretty standard HE spectrum (4000k 80 cri + 660nm). We added far reds, uva in same proportions and even uvb 295nm. The result was somewhat lack luster although it yielded quite well. But it didnt have the high or the smell or the taste of that 2700 tray. My theory is that the higher green content in this light may have erased any perceptable benefit of the added uv; green seems to have this antagonistic relationship to blue, its documented somewhere with regards to general botanics but i dont know where, messy quoter
. Dont have any canna related info on this but i have a hunch at least based on general.
Please dont base your decisions only on my ideas since they are far from complete, im still trying to evaluate if or how much yield loss the uv may cause.
If you want to evaluate differences between standard 90cri and this spikey 90cri type spectrum: we have measurements of both in the 2700k range between here and led tech web:
Supposedly arriving soon as per @mr. Amsterdam so it needs a thread for reference. 90 cri versions aswell, like we seen on bridgelux vesta.
www.rollitup.org
To my very cursory glance they look very similar in ppf efficiency; the values are very comparedable since both eb and led techs strips are based on 7diode strings: you can pretty much compare 700mA to 700mA on each side.
Not sure if it what you were looking for since youre looking at 4k but i cant really see these chips have much of a secret sauce in them by looking at numbers. Please tag me for your grow if you end up going forward with these.
