Sacrifice DLI or kelven

what that numbers guy said.

think your 67oz per your area is about 60g/sq ft. 70oz is 64g/sq ft. This is doable and repatable but maybe not every time. that will depend on zero problems and good genetics. Also, some people measure from the taint and call your 5"er a 9"er, so you never know with each individual how they are putting their finger on the scale. DLI (real dli) and ambient co2 are by far and away the most important factors that dwarf all other factors. TL;DR people that have trouble paying attention for more than 150 charcters should stop now. Technically better not to sacrifice dli, but you may not be doing so anyway given the amount of error of a phone app measuring ppf/ppe -- ppfd takes several measurements equally spaced and sasme distance from light across entire canopy and averaged out. if using a phone app to measure DLI it's off by as much as 10-15%. Your 3300K light will register a different value than the 5500K light even if they produce the exact same umol/s of PAR. All phone apps convert from lux using some conversion factor that will not fit all grow lights. your phone is not a quantum meter. light and co2, assuming competent growing methods, are all that matter for yield beyond genetics. The rest is such a tiny effect that you should never sacrifice overall light intensity for any common sense grow light context. 5500k might be a borderline good reason. You'd have to test and see. I find zero difference from 2900K and 3400K halves of my room - from vege to flower things turn out more or less as i expect. the dense buds are dense. the bushy plants are bushy. Whatever effect cct has is so tiny you cannot see it with a small garden. 10,000 plants in a commercial context? it might matter. with average yielders you should be able to do 50g/sq ft, which is 540g per m^2. Better genetics will outpace that. Some plants are heavy yielders and some are not. I consider anything under 50g/sq ft a shit-ass plant, but others may feel differently. That doesn'tmean i nexpect zero defects and zero hermies. they are bound to happen and that obviously ruins any targeted grams per area goal. supposedly that 5500k will result in slightly fluffier buds, but how much? it should cause slightly more branching (proven effect) but that effect is not profound. Just how profound is it when it comes to buds? if there is a yield difference between those lights it'll be more so due to differing DLI 90% than cct 10% - i'm pulling those numbers out of the ether but the scale is probably being quite liberal with the supposed effect. dli and co2, assuming other things are done competently are 90% or more of the contributing factors to yield. 42dli, if accurate, might be too much for ambient co2, too. So, you may not see damage immediately, but it's also not gaining any weight from the excess photons. Might just be thinning out the pigment like it would under the sun. Leaves adapt to the light you provide. This should make you think twice about drastically shifting light properties from vege to flower. the effects of differing CCT are tiny and the effect of overall light intensity is great. cocoforcannabis has a couple good articles onthis -- avoid the forums as that's rife with bad info from user contributions, lol. dr photons corner and their guides are good though. People like to extrapolate and sound science-y, but these effects are tiny to start. they ignore that scale as they form poor conclusions.