The more "U"s they have the better, 6500k for veg, 2700k for flow. Good and cheap? Look around The agros are the better ones, but they aren´t cheap, nor small 125W+ (many of the higher wattages is also E40 bulbs, not E27 which you normally use in a household...).
That was the advice I could give, but I more and more tend to agree with those who says that if you had money to buy weed why being cheap on your own grow and equipment
yeah i know i shouldn't be so cheap but my girlfriends mom found these plants in a backyard so i don't want to go all out on it if it's gonna turn out shitty anyways lol
great value 3 pack of 2700K, 23W-26W lights = $5 at walmart. I use those for flower. And then I use the GE 6500K (a bit more expensive for this color light) for veg.