Easy to buy 250 and 300 wt grow bulbs here. I use two 250wt 6,500K for Veg and two 250wt 2700K for flower. The cool thing is they pretty much put out no heat so i just keep a small fan pointed up through the middle just to keep the air and plants moving a little. The other thing is using these lights my electric only goes up about $50.00 a month.