Amazon has a few. It figures that RV, off the grid folks, anybody on 12volts, can use them even in household fixtures, just direct wire to 12 volts.
Not sure about light output but they sound brighter(reviews) than the 25 watt I'm using, and use only 5W with the LED bulbs.
Cheap too, 5 to 10 bucks. I'll try a couple.
http://www.amazon.com/LEDwholesalers-Camper-Voltage-LED-Light/dp/B004QZYTCU/ref=pd_cp_hi_0