I'm looking for a way to create a fairly tight spot of light (~4' diameter at 15 ft.) I currently have PAR38 fixtures and I'm getting ~15ft diameter spot at 15 ft with a "flood" light. Will a PAR "spot" light get me <6 ft at 15 ft? Also, what's a ray light kit? Would this help narrow/focus the beam? Any (relevent) suggestions would be greatly appreciated!