Quote Originally Posted by bluntwiz
i dunno what spectrum it is unfortunately =(
if you look at the base of the bulb you should be able to find the wattage and the spectrum, it will read something like 2700K or 6500K, the K stands for Kelvin and it's a measurement of the 'warmth' of the bulb.

what you need to know is the higher the Kelvin number the cooler the bulb (spectrally, not in regards to heat)
during vegetative growth you want mostly 'cool' white, or 'daylight' bulbs, as Stinky said (4100Kelvin to 6500Kelvin)
during flowering you want mostly 'warm' white bulbs (1900Kelvin to 3000Kelvin)

you need both spectra during the entire life cycle but, during veg, too much red or 'warm' light and you're gonna get stretching

also as Stinky said, you need the lights as close to the plants as possible without it being so close it burns the plants
put your hand under the light and move it closer and closer until it gets uncomfortably hot, thats your limit, any closer and you get burned, and so will your plants

another thing, seedling stretch is pretty normal and not something you should be manically worried about, just, when you transplant into bigger pots, do as Rusty suggested and bury most of the skinny little stem, almost right up the that first set of rounded leaves

oh, and Stinky was right about adding more light too
too little light and the plants will stretch trying to reach the light

anyway, good luck and keep us informed

ps: i don't know for sure but i'm pretty sure Stinky would tell you not to leave any of the rockwool exposed