Opinions?

You can find 2.9umol/J lights for 1 USD per watt or less, nowadays. These seem a little overpriced, but from what i know the costs of equivalent and even the same equipment are a bit higher in europe for various reasons, so maybe it's fine at that pricepoint if all the other similar equipment is also at that price range. ************** do you need 1800 umol/s of light or ~2800 umol/s of light? Assuming the lumileds diodes hold up to scritiny, this is the choice. ************** For photoperiods and ambient co2, you probably cap out at 80umol/s per sq ft (~37 DLI over 12 hours). It's all proportional from there.. 18h operation with autoflowers can cover 1.5x more area and still provide the same 37 dli. (2/3rds of 80umol/s per sq ft.) Might need 133% more light, respecitvely, for supplemented co2 context? it'll be fairly proportional to difference in DLI that it can handle withthe extra co2. The cost won't justify co2 supplementation. better off just expanding garden size if you need the extra production. 50-55 DLI? 55/37 = about 150% more. by that math but the proof will be in the pudding and depend on several local variables as to exactly what you will experience with added co2. The better you control temp and rh the more potential photsynthesis you can crank out. Looks like virtually the same efficacy, so 1000w just covers 66% more area. The other thing to consider is frame size / diode distribution relative to stated area of coverage. if the 1000w is designed for supplemental co2, it likely has a tighter diode distribution than the 600w (proportionally speaking). you can do the grunt work on that.. easy math. The zeus pro 600 uses samsung diodes and the 1000w extreme uses lumiled. You'd have to compare the samsung.com and lumiled spec sheets (your grunt work, not mine). then make sure they are being run at testing power paramaters and if so, can make an honest comparison. I'd go with the samsung diodes only because i am not familiar with the lumileds. focus not just on day 1 efficacy but longevity curves... i don't think many diodes can hold up to the lm301 diodes over time. do you need 1800 umol/s of light or ~2800 umol/s of light? Assuming the lumileds diodes hold up to scritiny, this is the choice.

Check out Bestva Spirit-x 720 watt. 199 usd shipped. That's in U.S though. Price per watt cant beat that deal the wifif app is a little funky but can get an outlet control. I can only run them about 60 percent before I'm bottlenecked at heat. They are on my Purple Haze and grandaddy black at the moment. Totally get if you don't want to buy that though. I took a gamble with them and overall very satisfied for the price. I convinced my friend to get two one for a veg and one for flower tent and his stuff is doing very good right now. the rj11 is not the same as other lights its a bigger connector so can use that unless you got crafty.