New leaves yellowing could be related to nitrogen problems instead.
Old, low leaves yellowing on a vegging plant is more indicative that they're not getting enough light.
stinkyattic Reviewed by stinkyattic on . move to CFL box, yellowing leaves since my friend put his babies in a cfl box, they have been doing well but looking a bit less green and more yellow in the leaves. his box is two 50 gallon rubbermaids on top of each other but the babies are raised halfway up. there is a total of 8 x 23w 1600L (2700K) and 2 x 43w 2600L (2700K) totaling: 268w 18000Lumens. the square feet of the babies is about 3 ft across 2 ft wide probably. also, they are about 1ft tall and quite bushy (LSTing) and he has induced 12/12 for about half Rating: 5