how do you add lumens together?

prizm23a

Active Member
if i have 3 24" flourescent 550 lumens 2 24" flourescent 900 lumens 4 1600 lumen cfl's hanging about 3-4 inches from my plants how many lumens do i have total? and is that enough for vegetation? all the 24" lights are blue or full spectrum for live plants in aquariums
 
Top