First, congrats on your first grow! :thumbsup:

Second, you should aim for over 5,000 lumens per square foot, with 3,000 lumens per square foot being the minimum. But aim for 5,000 or more. For that many plants, I'd looks into an hps system, at least 400w, 600w probably the best, or a 1000w if you want to go all out. Just remember that these lights will put off a lot of heat, so you will end up spending as much money (if not more) on your ventilation system as you do for your lights. You can grow with just fluoro's and cfl's which will still give good results, but you will need a lot of them. http://boards.cannabis.com/grow-log/...ars-green.html <-- That's a good example of a successful cfl grow. Browse around the grow logs for more ideas about lighting and ventilation combinations.

Third, you should fill the cups up with more soil. The soil now looks a little low, and there could be stagnant air in the cup, which can cause a problem (some disease if I remember correctly). Yes, the stem will eventually grow roots out of the buried part. I think I see some perlite in your soil, but you could maybe mix in a little more from now on. The soil should be nice and airy, and drain well.

Finally, get a fan to blow over the tops. This will help keep temps down with the additional lighting, and also strengthen your stems, and reduce stretching. One of those big fans that swings back and forth is good, and you can use it throughout the grow.

Good luck and keep us updated :jointsmile: