astronomy420a
omBUDsman
bill a little tough to understand your question?
one bs 240uv would not be sufficent to light a square meter, 1000w hid, mh, would be good for a square meter. but it is not targeted spectrum, like led's, so you lose most of the wattage to heat. two 240wuv blackstar's would do a square meter, for medium size plant's. maybe if you rephrase the question, we will have better advice.
::smokebuds:

