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Hi! I've read that cannabis grows best with 50-75ppm of magnesium in water. I realized my water has only 6ppm, most brands have these amounts only in very high ec levels. Do you guys suplement with pure magnesium/epsom salt all the time or only when deficiency is showing? That's the article...

Hi, great side by side. Beautiful plants. I’m trying out the clu048 1212 303 h7 right now they are 97 CRI. Plants love them and the amount of resin is crazy in my conditions.

They work very nice in veg indeed. Just a couple weeks ago I finished ebb&flood veg and cloning area powered by PRBs. Very happy with the results. I'm running 4 cobs at 80 w each for 4x4 area.

Okay. Fair enough. I should have been more specific. Next to the prb 320w panel, there was a clu04830h7f 320w panel and it did way better in terms of yield and flowering /ripening period and these cobs are way cheaper.

Sorry for The delay. Definetly do not recomnend clu04h for bloom. It lacks in red spectrum. Blue and red is even and more red is needed to properly finish flowering. So there are lots of cheaper and more efficient options.

I think Harvest will Begin in 3 weeks. thank for The thumbs up. really apreciate it

different lamps are for lighting quality only

Also a great tool! Thanks.

Ten days after flip. Going strong

This another lamp I build. This time I've used 5 CLU048-1212C4-403H7M4-F1. They have >97 CRI AND the colors are breathtaking. A must have for diagnosing plants. I plan to make a mobile version of it too diagnose on the go.

Thank You for this info. Can You point me where to look for more info about green and other parts of color spectrum being used by cannabis plants?

Works great in veg. Just flipped some plants to 12/12 yesterday. I will put some results here.

That's an option. I just like to drive them hard close to 70-80% max

My supplier just received 16 clu05h 400w cobs. I don't even know what to use to drive them hlg 480 each :)

hey guys, i ould love to try these. whats the best place to get Quantum Boards?

Yes I agree they don't care about CRI. I should have been more precise. 99% graphs I studied were citizen clu series. So in this case higher CRI means red peak is shifted away from lumen area (around 600-610 in lower cri) to the longer waves which are better for chlorophyll (642-662). In hps...

Studying spectra output graphs of these and other COBs got me thinking. The lumen efficacy of a cob is not what we should be looking at. Since it represents the efficiency of a light source in a "lumen" range of spectrum. If we can agree that Lumen range is not ideal at driving photosynthesis...

Hi, I managed to buy 6 of these COBs. Citizen horticultural LED. Plant RB version 200w. which is supposed to be best for plants. There is also a plant white version which suppose to be used above workstations for people to have better comfort and ease of plant diagnosis. Anyone has any...