Originally Posted by headshake
LSY, if you have 12600 lumes in a 6-9 sq ft area then you are okay. you want a minimum of 5000 lumens per sq ft normally though. so if you can shove more light in great, if not, let it ride and see what happens!
i think you have a lot more reading to do. how do you figure that you have 400W of light if 4*26= 104W? also, aluminum foil is not the best choice to use for reflecting light. i hope you are at least using the dull side. you would be better off using flat white paint. and if your plants are better than most around here then start a log.
-shake