ok i got this light bulb. it from feit electric. 23w 120vac 60hz 380ma.well it work? when i put it on it light up kinda blues day color. ok thanks you. ohh one more thing look up BPESL23TM
don't do it by plant, if you do it by plant, you could still lose a lot of lighting.
WE NEED YOUR GROW AREA DIMENSIONS. You need to fill the AREA with light, not specifically the plant. Plants grow outside of the light beam in many cases so you need the area to be covered.
It's 5000 lumens per sq. ft. at optimal coverage for vegitation. You'll want about 6000 lumens per sq. ft. at optimal coverage for flowering.
HOWEVER... note that you may need to do your research before setting anything up, because if you place just three lights up at the top of a large grow box, you will NOT get the light penetration you need down below the canopy.