Daylight cycle, Sanlight evo5 120

" in a 1.2 x 1.2m tent provide Ø PPFDe values of 1,100µmol/m2/s. " "320W at 870µmol/s" Well, this is a bad start... because, these 2 things cannot be true at the same time. 870umol/s in a 1.2m x 1.2m (1.44m^2) is 870 / 1.44 = 604.17 PPFD ... So they are already lying their asses off or really bad at math. 870 / 320 = 2.72 umol/J efficacy -- if true this is fairly decent. Not top-quality but approaching it. (2.9umol/J or a bit higher is ceiling at moment). This is the efficacy rating and it directly correlates to longevity. larger the number the better but if you see something >3umol/J they are probably lying. (simply, it is the 'light produced' to: 'heat produced' ratio of the light) So you have 870umols in a 1.44m^2 space is 600PPFD. I would not use this in anything larger than the 1.2m x 1.2m if running on a 12/12 cycle (amounts to 25.9 DLI) for photoperiods. It would be much better for autoflower in this 1.44m^2 area runningn 18 hours per day (38.9 DLI -- can see this is 150% more might per day on 18hours vs 12hours). THIS may need a slight dim of 5-10% or an extra inch or 2 of height etc when running 18hours and covering 1.44m^2. This will push the limits of atmospheric CO2. 35-40 DLI is about as high as you can go with ambient CO2 levels. 25.9 DLI is close to minimum amount of light you'd want to bother with to grow photoperiods. Anything that equates to less than 22 DLI is probably going to grow trash. So for autflowers, it's a great light for a 1.2 x 1.2m garden. For photoperiods, you can get away with covering that much over 12 hours in bloom, but it won't produce quite the same quality of nugs. I'd probably slim down the area a bit if you do photoperiods. Lower light and expect to cover a bit less space in that tent for photoperiods. 1m^2 would be better for photoperiods. *** remember, during vege you need 66% of power if at same height in bloom... so while covering less space during 18/6 cycle, you may need to dim or raise light further than normal, then when you go to 12/12 you are basically boosting light 150% to provide same DLI over 12 hours vs 18. dli is proportional to hours of use. It is relative to 1m^2. Because of these 2 things, we can use DLI between 2 drastically differently sized gardens and any sort of light cycle someone may use. it is apples to apples comparison. Daily Light Integral.. you don't need to know the math, but it helps greatly to understand the concept.