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Do you understand what Relative Energy is?

You mean nanometers?!?! What did I miss?? Hahaha I might put down the High Times or Jorge Cervantes or wherever you get your info from.

LOL :lol: Looks to have plenty of Far Red to me.....

Well they tested wavelengths all the way up to 780nm (with many different instruments), where photosynthesis was no longer stimulated. The far red wavlengths increased the total amount of red wavelengths that could be synthesized. Without far red, photosynthetic efficiency of 650nm wavelength...

How so, if you don't mind my asking?

I'm aware of the Kessil H380's spectral analysis. My point was that oversaturation of red light can cause photoinhibition i.e. having your Kessil too close to the canopy. There is also very little (if any) far red wavelengths and this will effect the maximum quantum yield of photosynthesis...

How much light within the red spectrum can a plant absorb? The photosynthetic maximum? In absence of other colors? Wattage has nothing to do with Photon Flux btw...

Light intensity is an issue if the leaf temps are too high or too low. The factors that affect photosynthesis are pretty well documented.

Judging by that picture, the high CRI still seems to be the best choice of spectrum. Now that I have some real world experience with these chips, delivering enough photons to the canopy with COB's is of no concern. It's actually exceptionally easy to do. Might as well pick the best color recipe...

@Growmau5 regarding your fixture.. Have you considered using wider angle optics for your center lights, while keeping your narrow optics on the outside of the fixture? It may help to alleviate the light density in the the center of the footprint. Awesome fixture man, you are always killing it.

Wrong thread.......

No resources here, but I've been trying to keep my environment within the 'acceptable' range of VPD, while simultaneously trying to keep leaf temps high enough to actually photosynthesize under high PPFD conditions and high CO2 levels. The closer all the parameters are to 'ideal' the plants seem...

Wood is insulating and won't be conducting much heat away from those drivers. I would mount them on aluminum in an open area or at least mount them in an area with decent air movement. So this doesn't happen...

Well guys, they are at it again and this time claiming to be "The Most Powerful Grow Light "In The World". https://www.spectrumkingled.com/product/spectrum-king-600-led-grow-light/ While that claim is still TBD, the lower profile of the fixture looks to be almost half the height of the older...

Beautiful nugs @Greengenes707!

Thank you very much man!!! That really means a lot! :joint: Next round will be better, just getting the hang of living soil.

Banana Kush Day 80

Grown under Vero 29 3500K. 2nd Round. Dakini Kush Day 63 Banana Kush Day 68 Snow Cap Day 77 ...close up. Blue Dream Day 65