Try and get higher watt as the 23's don't give off too much light, also you need to keep within an inch of the plant to get any good results.. 32 or 40 watt should be a min, not saying 23 don't do anything ~ just alot less.. And reflectors help tremendously..
100w total for one plant minimum...,more the better. also try for 6500k the whitest light available i believe