Well, I ended up purchasing the 796 bulbs from candlepowerinc.com, they are almost exactly 800 lumen compared to the oem 400 lumen bulbs. Unfortunately, the resulting light is still very weak. Ultimately it comes down to the fact that the X3 reverse light housing/reflector are too tiny to produce much light. Any LED option would be WAY more pathetic than even the oem bulb. About the brightest LED setup might get near 150-200 lumens which is still only half the brightness of the oem. The candlepower bulbs look more like a video projector bulb than a car bulb, but like I said the result still isn't bright like I wanted/needed.