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Suggestions for a single driver to drive 4 of them at 1400ma? Dimmable a plus :D Should be my last question though, I know I've been as nusiance. Will defiantly be directing friends to your site though.

What do you think is better? 2 3618s at 150w each or 4 1825s at 75w each? Less wiring with the 3618, but more cooling required. I wonder if you could kapton tape a Cryorig M9i CPU cooler to these. They're $20 coolers that perform good as a lot of $50 ones.

I meant to say: 2x 3618 at 150w Or 4x 1825 at 70w Shooting for about 300w in an 8sqft area. Would either of these solutions be worth pursuing or am I going to need more? Which is more preferable?

The 1825's are interesting now. Jeez now I see the 3618 too. 4x 1825's @ 1400ma 2x 3618 @ 1400ma Now I'm looking at your light engines too. What one would be better for me you think? I was thinking the 1825s for more spread, but idk now. 3618s are almost more cost effective due to needing...

Indica if it makes a difference. So much good info I'm getting today :) Bedtime for me today. Hopefully this weekend I can put everything together and get a final price for the build and order. Bedtime now

This shit just went way over my head LOL. I'll give it another look in the morning. I appreciate how I'm depth you're going

3500k. I believe this is the best all purpose temp?

I got my numbers from some charts on this post here: https://www.rollitup.org/t/cheap-and-cheerful-diy-using-citizen-cobs.909460/page-13 Post 250

No different than buying a more expensive binned chip isn't it? Price 4 Citizen 1212's $44 4 CXB3590's $120 Difference of $76 Efficiency Citizen 45% Cree 56% Difference let's say 10% If my bill from the LED setup is about $30, I'll save a measly $3 a month. A grow is roughly 4 months long...

How do you calculate ppf?

Yes but that 1/3 as much will come back in electricity savings in just a couple grows I would imagine. How do you calculate PPFD cause I'm doing something wrong apparently.

Initial price yes, efficiency no. Running at the low currents they need to be competitive with Cree, I don't want to sacrafice light penetration. 56% at 1400ma isn't bad at all.

Could you show me how you calculated that by any chance? I have a spreadsheet I messed up on apparently.

This is what I was kinda expecting, glad I asked. I'm going to buy 4 36V 3500k 80CRI CBX3590's, and a single driver to run these at 1400ma for an 8sq ft area. Should give me 714PPFD if I did my math right? Would this be a good driver? This will be a huge step up from that crappy Mars300 unit I...

Oh really? That's it? I see people with 800-1000ppfd all the time. Are the CXB3500 36v still the most efficient at 700ma? I see they're at .64 currently.

What's the recommended ppfd range to stay in?

What would a good minimum and optimal ppfd be for an 8sqft area?

What is optimal ppfd I should shoot for without having to inject carbon dioxide?

Now I'm trying to balance efficiency, initial cost, and PPFD. Anyone want to make sure I'm calculating PPFD correctly? What are optimal PPFD numbers I should be shooting for? From my understanding, PPFD is measured from 1 foot away? I was thinking 1000 would be good, then the lower branches...

Ahhhh there we go I just misread something. So are lenses worth using then if they won't help with penetration?