Something does not add up 3 420 , that not a hps it not a mh. Now if its one of them fuky envirolets, thats your problem.
If a bulb says it puts out a x watt of light, but uses x watts. You use the watts it uses. 60 watt cpf uses 13 watt and puts out 13 watts of power. To save you plants , get some more lights and cpf can be put about 3 in from the top of the plant.
Remember a stealth grow only works till you plug it in.
Get a 400 watt mh or hps bulb , that should kick them in the buds.
and do not use 24 hrs when growing, and 12/12 of blooming must be totaly dark, no light what so ever.
One thing just poped in to my mind , if you have not sexed them they could be males , as males grow , real fast.