Your 100w blackstars are probably 70w at most, and more likely 60w each. Basically with the 3 of them, you will have pretty much the same power as a 250w HPS, maybe a bit more but I would not count on it. I think you should go with no more than 4.5 sq. ft. and 2 or 3 plants if you don't use LST, SOG/SCROGI just recently got in 3 black star lighthouse 100 watt UFO led 2w chip, now I was told that 300 watts of led=1000 hps now is this true? And how far spaced should the lights be from each other, and how far spaced from the canopy , and how many plants my 3× 100w leds?
It definitely can't hurt to use them with the 1000w hps, but how much they will benefit from adding such low wattage leds may be un-noticeable. Perhaps consider using the leds for veg and first week of 12/12 before using all that unneeded power. Just an idea.I have a 1000w hps I was going to use In conjunction with the leds is this a good idea or a waste of time either pick one or the other