Pics or it never happened
Going from hps to 3590's you should see a huge difference but I'll defend the 315's against 4x 3590's all day long until I see them pull an elbow. I think the 315's can, we should set up a friendly competition 
Very nice grow, 250g would be a nice pull from 200w. But here's where I'm skeptical on 4x 3590/200w vs. 315w CMH. Most I've pulled with the 315 is 1.2 gpw or 378g total. I have a lot of pheno hunts going on but I'll setup a run for some weight in 8-10 weeks. I'm sure these can pull well over 400, even 450g with a decent producing strain. The 3590's would have to pull 2.25 gpw to hit 450g, that would be impressive, I'd buy a panel next week if they can do that.
That's an interesting point. But, isn't that apples/oranges? It reminds me of that guy a few months ago DIYing his own epistar fixtures, poo-poo'ing w/sq ft. efficiency with g/sq ft. He threw 70w/sq ft of epistar -- and then proclaimed his 60g/sq ft superior to the 35g/sq ft realized by the 30w/sq ft guys.
I'm thinking gpw would account for any difference in the wattage, the question is proving out the claim that 200 watts of 3590 could match the yield of the 315's. You'd have to do a side by side with same clones to really get a comparison. Give them each a 3.5 x 3.5' and see what they pull.
Ha I've already crossed to the dark side, I run 200w of COBs in a small tent, mainly used for breeding but I flower in there the odd time. I have another 300w of 3070's I haven't put together. No need to sell me on COBs, I'm just a little skeptical on the 3590's being that much better, gotta see it. I run 50/50 soil/pro-mix and feed every other watering. Those pull 345w at 240v and 365w at 120v, they're not record breakers, but for anything other than COBs they're a nice option. They (2x315's) only brought my temps up 4-5F overall when I switched them out for same wattage in LED's, all I use is 4" exhaust and intake, mostly running at the lowest setting other than in mid-summer. These are not hps, nor typical MH bulbs.
Can you recommend a cob build tutorial? I want to introduce cob lighting into my bloom tent. Thank you.
Hey Darth, if you're looking to build best place is right in this forum, here's some threads, some focus on particular parts but many cover all aspects within the thread, you have to pick through the subjects and scan them but all the info is right in here. If you're starting now I'd suggest looking at the 3590's, apparently they can produce better than 2gpw
Thanks buddy!!Hey Darth, if you're looking to build best place is right in this forum, here's some threads, some focus on particular parts but many cover all aspects within the thread, you have to pick through the subjects and scan them but all the info is right in here. If you're starting now I'd suggest looking at the 3590's, apparently they can produce better than 2gpw
A few direct links to threads I keep an eye on for ideas/info:
https://www.rollitup.org/t/diy-leds-how-to-power-them.801554/
https://www.rollitup.org/t/matching-drivers-and-cobs.883866/
https://www.rollitup.org/t/realstyles-6th-diy-cxa-3590-5000k-db-bin.864284/
https://www.rollitup.org/t/boxes-or-some-type-of-enclosure-for-diy-lights.892647/
https://www.rollitup.org/t/yet-another-b3590-build-180w-ufo-killer.891337/
https://www.rollitup.org/t/top-bin-cob-comparison.891010/
https://www.rollitup.org/t/another-cxb3590-diy-thread-ppfd-and-passive-cooling-questions.892413/
https://www.rollitup.org/t/heatsinks-for-diy-led-lamps.851907/
https://www.rollitup.org/t/help-me-build-a-large-cxa3070-rig.884186/page-2
https://www.rollitup.org/t/limos-cxb3590-build.882954/page-2
(many, many more good threads in this section, this was just from the first couple of pages)
Some nice design ideas on fixtures in here:
https://www.rollitup.org/t/pictures-of-your-diy-lights-post-your-pics.871625/