a 12" flouro is good enough for seedlings
you'll need much more wattage as the girl (hopefully) grows up
60 degrees is amazing... lower temps seem to bring out a darker, richer color of the plant (possibly a purple
) but if you really want to grow, get some CFLs (the twisty kind)... maybe 2-3 45 w... you wont get much bud but its the best kinda light for a small, new grow.
if you have the money, you could get a low wattage metal hallide or high pressure sodium bulb
they sell 60-90watt mh and hps bulbs at home depot, but you will need a ballast i think those are found at home depot also
hps is much better for flowering because it is more on the red spectrum whereas metal halide is best for vegetation on the blue spectrum
but once you get into bigger lights you run into heat problems... its a vicious cycle
make sure your temps stay below 80 degrees F
peace and stay blazed
Nugz