I've heard that LED obstruction lighting will reduce the electrical costs on my tower. Has anyone done a comparison of the total cost of conversion (from incandescent to LED, to see how long it takes to pay off the conversion and see the savings? Is there an LED lighting system that will connect with the existing incandescent sockets? It seems to me that that would make the installation much more cost effective, if you could unscrew a side light and screw in an LED replacement. Thanks!