Not sure, that’s why i was asking. I’m sure it will grow weed though.
idk about COB, but i have flowered under 400w HPS and MH,
if i had to choose one over the other for germ to jar it’d be MH.!
growth (veg) is better/faster under MH, flowering plants stayed shorter also,
they fatten up into baseball shaped buds, not the x-mas trees we want,
trichome and resin production was on point.!! more then HPS, idk.
trich maturity was a little screwy, they want to keep producing new trichs until harvest.
not sure, but i think the MH outproduced the HPS by a few grams…???
the only draw backs to using veg light for flower was the shape of the finished buds and not knowing when to harvest according to trich development.
i quit looking at the trich’s and started judging maturity by the look of the plants.