This is multi faceted question. When you are discussing photon intensity in terms of photons collectively this is ppf and takes no account of photosynthetic efficiency of specific wavelengths. Ypf (yeild photon flux) would be the measure of photosynthetic efficiency of each wavelength.
If you want to speak on individual per wavelength basis, the graph below shows the relative quantum efficiency per band.
This is exactly what brought us to early blurple led fixtures. Without going too far down the rabbit hole, the performance of said fixtures compared to something like even a first generation quantum board should say everything it needs to about solely targeting ypf over total ppf. Wavelengths outside of blue and red may not be the most photosynthetically active, but they are still responsible for certain plant processes and responses. The next chart shows how ypf and McCree action study data would be blended
Does it look familiar? This is basis for pretty much every “high end” fixture or knock off currently available. But going back to ypf is the reason you see 660nm added to base phosphor coated leds.
The chart below us from bridgelux and shows their 80cri phosphor above and 90cri phosphor below. You may have to look close, but anything 4000k and warmer will show peak around 600nm on 80cri. If you move to 90 cri chart you can see that those same peaks shift over about 630nm. Which helps in terms of ypf, but in most documented cases the total amount off ppf at given power goes down. In short, it’s more difficult to get the cleaner looking or more photosynthetically efficient light out of the leds. To the best of my knowledge, the higher the cri gets the less photon efficient they become. Hlg pretty much tells you this in their advertising, by way of saying “not suitable for main flowering lamp”. This is because they know it will take a lot of their high cri light to produce good grow results and they’re not going to stake their reputation otherwise.
Nichia and cree have had 5000k 98 cri that has basically matched sunlight spectrum within par region for quite some time. Cutter has offered the nichia for at least 3 years to my knowledge. Imo there is a reason they hadn’t already taken over the market. That reason is most likely because the ppf/watt is too low to make up for the performance of the broad/even spectrum. And has pretty much left its appeal to those who are strong believers that the sunlight spectrum is better than artificially created light spectrum. To get much more than that you would probably need to get with someone like greengene or growmau5 who’s job is to make these more targeted breakdowns.