M
ive been succesfully growing plants with a 12w 6700K led bulb de-lided, and for flower 20W cfl.
:D 3 $ total budget ive been running for some time , and it works.. (tbh i put 3x cfl 20w for flower )
the range is 10-15 cm from plant, never been puting them 40-50cm with weak lights