I am using 11X15w cool white (4000k) CFL's plus 2X18 watt cool white T5 tubular fluoroscents and have 80 plants (I'm expecting a lot of males!) vegetating for 24/7 under them. I am going to add another 20 cool white CFL's soon. Altogether that will be 465 watts of light. They are at 7 weeks (day 50). Four of the plants immediately started budding when they reached the 4th node and now have some really nice looking solid chunky 'buds on a stick' tops on them which I estimate at 2-3 gms dry weight. I am assuming these plants are 'Lowryder' or a similar autoflowering strain, but I have no way to tell since they are just from a heavily seeded bag of unknown origins.
I was considering using a 600 watt HPS for budding but the heat is an issue, also the confined space I'm growing in (under a table in my living room) and also, since I don't actually smoke and am growing them for fun (nostalgia) I can't validate spending the extra money on it.
As far as the debate between CFL's and HPS for budding goes, here are some distinct advantages of using CFL's over HPS,
1.) There is a way of wiring CFl's in which you don't require any sockets, so the extra costs associated with that aspect of using them (as mentioned previously in this thread as a disadvantage) can be dismissed.
2.) The amount of lumens a HPS globe emits begins to deteriorate over time, whereas, (I'm not certain of this, though), I don't believe this is the case with CFL's. Therefore, the life of a CFL is possibly longer than that of a HPS. (It might, however, be so negligible an amount of time difference between the life of the two types of bulbs that it's of no consequence though.)
3.) Although CFL's need to be moved regularly to evenly distribute the light throughout the plants, and to some this is a disadvantage, it could actually be advantageous to be able to place them around the lower limbs of the plants, something that's just not possible with a large single bulb such as a HPS.
4.) If the advertised ratings are correct, the wattage of a CFL is equivalent to much brighter incandescent bulbs, for example a 15 watt CFL is supposedly the equivalent to 75 watts of incandescent light. This would mean that 450 watts of CFL light should be the equivalent to 2250 watts of HID lighting, whilst drawing only the charge of 450 watts, if this assumption is correct. The comparative difference in the consumption and therefore the expense of the electricity is going to be an advantage.
On all of these points I'm happy to be proven wrong!
Though this section is specifically for those growing with CFL's there do seem to be a few posters who are HID enthusiasts who are voicing their opposition to the CFL growing technique here. I hope they are not doing so out of malice, but it would make sense that someone who's had a heated debate with a CFL grower might be enjoying venting their spleen on other CFL growers.
Hmmm, maybe it's time to start a thread, 'The Definitive Ultimate Debate Between HID and CFL - What's the Best'?
That should get a few people screamin' !