L.E.D. lghts work very well in my opinion. i have a couple green star grow bars and some red l.e.d. panels for side lighting. they cost some xtra money but they work incredible for vegging (greenstars) and the red panels make an awesome side lighting for fat lower buds when used with my 430 hortilux i have gotten the fullest buds from top to bottom when usually my bottoms were quite stretchy in the past. all of the under branching thickens up amazingly adding about a 10%-15% overall yeild to my plants. wich is quite a bit. i would reccomend using leds bottom line.