Optimal Growth....7000 Lumens p/Sq Ft.
Adequate Growth....5000 Lumens p/Sq Ft.
Minimal Growth....2000 Lumens p/Sq. Ft.

The faster you get the lights you need...the better.
HARDDON Reviewed by HARDDON on . Compact Flourescents Quick Question? My signifigant other who is much smarter at this stuff brought home two 23 watt/1450 lumens (ea.) CFL's for our 26.5x19x53.5 (about 4 sq ft) grow space. We have some newly planted seedlings with root hormone started in potting soil (non-enriched) in jiffy-pots. I wonder if this is ok to use for at least the first 30 or so days or for sprouting? Rating: 5