One 23w cool white cfl bulb will be good for your cloner, get the spectrum that has 6400K. Do not get the soft white color. You get better results in veg and cloning using the cool white color. Preferably you'd want to put the back of your hand under the bulb for 10 seconds, if its too hot for you, its too hot for you plants, i put mine about 6" away from the plant using cfls, i put it at 8" away when using multiple plants. But one will do just fine