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Hold on you're saying the HLG240H-C1050A can run 4 cobs for 250w while the C1050B only goes as far as 218w?, that's quite the difference.. Thank you, which one of these three setups do you think would match a single ended 600w HPS? can i get away with the 298w?

the 1818's with CC drivers? i'm open to suggestions..

I think i got it, with the HLG240 i can run 4 cobs at 200w and with the HLG320 i can run 4 cobs at 280w, both cases not really utilizing the drivers to their full potential, would it be possible to run 4 1818's @ 1750mA for a 350w total or will the 320w driver not be able to support it?

Holy hell thats a lot of growth for 3 days.. 9w you said...

Excellent post, thank you. i'm thinking about pulling the trigger on 8 90 CRI 1818's to build 2 lights with, one with an HLG240H-C and one with an HLG320H-C, i'm just not sure what mA i should go with...?

Did i miss the 3500k 90 CRI 1818's? or are they not up yet?

Not sure about his 9W led.... but i got these babies under 2x14.5W led bulbs, yes those are beefsteak tomatoes.

Well just finished reading through 141 pages, fascinating so far. after seeing the clear difference between 80 & 90 CRI in The Dawg's ongoing grow off, when can we start expecting these boards in 90 CRI flavor?

Jesus the trunk on that 90 CRI plant..

Wanted to ask if you found a way around this problem? is this the reason why you went with the 1050mW drivers for two lights in this side by side thread?

I too had the exact same problem, but after reading countless threads, charts, spectrum graphs, side by sides and comparing lm/W of basically every single cob out there i've come to the conclusion that while pretty much anything will grow good plants, if you want the best bang for your buck...

All this cree and vero talk, wheres the love for Citizens?

Exactly my thoughts! i mean isnt it easier to produce green and blue then red? of course the lm/W will increase if you produce less red and more blue/green..

i like the 3500k 90 CRI spectrum much more, if you look closely gen 5 and gen 6 dont actually have the same spectrum in general, gen 6 is a bit more green and blue with less red, gen 5 peak is at 630nm while gen 6 is at 620nm, not a huge deal i know, and if gen 5 or 6 were available in the 3500k...

Thanks man, i've been to cobkits/northengrowlights/rapidled a lot for the past week but none of them have a citizen in the 3500k 90cri range that isnt the CLU048-1212, i'm looking for either the CLU048-1812 or as you suggested the CLU048-1818, as far as i can tell running the 1818's with The...

Yes both LED bulbs are in the same 60deg reflector side by side, i jerry rigged an e27 1 to 2 splitter with some JBWeld glue and a few e27 bulb housings i had laying around, the variety is called "new big dwarf" by victoryseeds, i highly recommend this variety for indoor grow since it really...

Hey guys, i'm also doing an experiment with LED bulbs, i've got a dwarf tomato in an experimental DWC system, no air stone, only a tiny submersible pump that turns on for 15 minutes every two hours, just to circulate the water a little to keep the fertilizer from falling out of solution...

Hey man this thread is fantastic, absolutely great, actually decided to go for a Citizen build as my first cob light thanks to you :clap: A 4 cob build like you did works perfect for my space, i just want to make sure i didnt mix up the parts, you're using 4 Citizen CLU048-1812 3500K 90 CRI...

Good to know, thanks.

I see there's another 300W light just with Citizens CLU048-1212's instead of Cree's for $150 less and if i'm calculating the lumen output at 1400mA it looks like the Citizens are slightly more efficient? did i get this right? Lumen output for the Citizens 3500k 80 CRI @ 1080mW / 85C is 5702lm...