I found that using at least a 200 LUMEN rated LED boards on each side of the dual lamp fixture gave off the best light for us. We also went with the WARM WHITE model LEDs.. It truly is a hugh power savings thing to do if you like camping off the power grid like we do. They claim a 80% saving in energy compared to Incandescent automotive bulbs. Also a whole bunch of LESS HEAT involved. My plastic items around the light fixtures were all turning yellow and dark brown from excessive heat being generated by the Incandescent bulbs.
Please read the LED Replacement link provided by gbopp. He captured my LED post there also which has some info about the RFI issues I ran into converting over to LEDs. Regulated type LED BOARDS seems to produce small amounts of RFI signals that may interfere with a few of your things like the HDTV-NOAH WX Alert radios, etc..
Roy Ken