I couldnt agree with Bostoner any more... Take that incandescant out asap, and replace it with a couple more CFL's, or if u have the means, get yourself a low-mid wattage Metal Halide core and coil kit and corresponding lamp or two, and a couple low-mid wattage HPS core and coil kits and lamps, and either use the MH for VEG and the HPS's for FLOWER, or if you can control the temp and not burn the plants, then by all means, use both spectrums for the full term... I swear by mixing MH and HPS together, sometimes I take the MH out during early flowering, and I will add a low watt MH back in a few weeks in, then I will take it out and then I will put a 400W MH back in for the last two weeks of flowering, and my, my... The results speak for themselves... It's the difference in night and day, literally... And if you wanna buy some yeast and sugar every week at the grocery store, and make a lil CO2 generator oout of a 1 gallon milk jug, by filling it approx half way with water, and adding 1 lb of sugar, and about 3 or 4 packets of active dry yeast, then that will produce about 4.35 cubic feet worth of very usable CO2 for your bounty, and my Lord, those things will love you for doing that, and you will love the amazing results you will most certainly see, within the very first day or two of having that jug sit in your grow area... Mine is 4' X 2', and I have 3-250W HPS, and 1-250W MH, right now, which is 1 month into flowering, and in another 4-5 weeks, for the last two weeks of flowering, I will take the 250W MH out, and put in my 400W MH alongside the ever-burning 250W HPS', and the resin production will be in overdrive... My lumens are far above the "normal" required level, but my temp is very well controlled, and I have 11 lovely ladies, of which 7 r in 5-gallon buckets, and 4 r in medium-sized containers, and they thrive so well in my mini-ecosystem...