The addition of light is affected by the law of diminishing returns. If you put in a 1,000w light you would certainly see benefits over a single 600w. 2x 600w is overkill, and 1,800w is unnecessary and probably dangerous.

I would just use 600w and be done with it. It's only 5 plants! Better use would be to get a second tent for mothers and vegging so that you are running a tent dedicated to flowering.
bigsby Reviewed by bigsby on . haze x5 in tent hi people, i have got some haze x5 cuttings (never done this breed befor) .now they are about 12-15 inches tall now, is it a good height too click to 12/12? and i got them in square meter trays, is it better to water from top or from bottom of pots? and... e.g if i had 2 600watt lights on an temp was 27c or i cud give them another 600watt light so 3 600's, but it made it 30+c wat would be better for them? thanx.:) Rating: 5