The more lumens the bigger the buds, i use 3 heolgen lamps that puts out 1000watts
halogens dont produce the proper spectrum, i don't believe.
lumens and spectrum is what you want to look for, you want to get more lumens per watt of electrcity used. you want to go by both... thats the best answer i can give..
think of it this way, do you want a light that uses 1000watts of elec and puts out 5000 lumens.. or a CFL thats 42 watts that puts out 2900.. the answer is obvious. with enough Compact Floros you can flower good, the tubes will give you a bad yield. an HPS is more desirable, but it gives off heat, and costs more. but a 400w hps puts out 50,000 + lumens.
You want a more blue spec for vegging, and orange/red spec for flowering. white both can work all the way through, those give the most optimal results