Light recommendation

Short and sweet - any quality light that provides 1000-1100umol/s PAR that provides proper coverage for the shape of your garden (rectangle in this case) Might be best with 2 lights, as they are fairly squarish in coverage more time than not. A couple 550 umol/s lights would be great, for example. Or, if you find 1 rectangular-shaped light that fits well, that's awesome too. Autos or photos? will do numbers for photoperiods and know you can do 150% of the space on an 18/6 cycle or run lights in same space at 66-70% power for autos. .77 x 1.5 = 1.155 m^2. The goal is 35-40 DLI at the diode. You'll get a bit less than that at the canopy, but relative to existing grow lights, it'll be a good enough guesstimate. No matter what you'll have to adjsut height and power relative to context. No suggestion will be exact. A Daily Light Integral table makes for easy referencing. You just need to convert the umol/s of your light to PPFD to use the table. this is an easy task. Over 12 hours per day you need 900PPFD to reach 38.9 DLI, for example. Since your area is larger than 1 m^2, you know you need more than 900 umol/s. 900 ppfd * 1.155 m^2 = 1040 umol/s of PAR (PPE or PPF). Any light that emits 1000-1100 umol/s PAR wil be a great fit for this tent. Other factors -- diode distribution. Bars are better than boards. Quantum boards don't distribute light as well as the 'bar/strip' style frames. You have a rectangular area so you may be best off with 2 lights if you cannot find one that fits the shape well. Things like this are important, but as long as it adds up to 1000-1100 umol/s, it's enough for a 12hour operation context of flower phase. A good heat sink - doesn't take much to recgonize this.. is it flimsy? It doesn't take a highly rated heatsink Efficacy is a major factor in price point. Lights up around 2.7-2.9umol/J will cost more up front, but if providing same umol/s as a less efficient light, it will save youou money each month in electricity and how a longer lifespan. Samsun lm301B or H diodes -- they only last 50,000 hours or more if run within specific pramaters. If watts per diode is significnatly more than 0.2-0.25watts/diode, efficacy will be lower and longevity will be reduced. this is something many light companies copy and paste info from samsung's spec sheet, but then run the diodes hotter.. that's called lying. Some are worse than others. Anything advertising an efficacy over 3.0umol/j is likely lying. The non lm301 diodes as well as the warmer CCT diodes just won't go much over 3.0 even in the best cases. So if you see something insane like 3.5 or 5.0umol/J know that manufacturer is shady AF or half retarded. Once you know your target PPFD for 12 hour operation to get ~40 DLI, any change of hours is directly proportional to that value as long as no other factors are tweaked. So, on an 18hours cycle for vege, you only need 2/3rds the power at same exact hanging distance. Hanging distance should be about geometry of light coverage across canopy. Optimize that, then adjust power. From the same distance (vege or flower), you don't want to be using more than 2/3rds of power or you'll fall short in 12/12 operation of what DLI you gave in vege phase over 18 hours. Whether you run the lighs 12 or 18h or anything else within reason, DLI is what matters. 35-40DLI will be roughly the ceiling for ambient CO2. You'll need to do a little trial and error to see how far you can push it based on plant growth (too stretchy vs too tight is your guide) These numbers merely put you in a small ballpark. Some deductive reasoning and effort on your part is required. Temp, RH, and atmospheric CO2 will all impact maximum DLI you can apply. If heat is a major issue, prioritize efficacy. Get a 2.8umol/J or better light. these are the ones that last 50,000 hours anyway.

hum. maybe some of the SF bar lights that have removable drivers. I use Medic Grow's Mini Sun 2. I have 2x of them in 240w and they are OP for my 2x4 DS120W secret jardan tent. Even the 150w x2 by then would be good. Their driver does not remove though. however it does not take up that much space above the light. maybe 4 inches.