Can you find a stock Wrangler, sit side by side, turn the headlights on and take a picture? Have you done anything else to the Jeep, like a leveling kit, more weight in the back, etc to make the headlights higher? Are they loose? Are they adjusted level and at the right angle if you compare to a stock Jeep at 25 feet in front of a wall?
Honestly, I'd start with what I have above, because I don't know why they would actually be brighter. Last option, video the lights from a single location as they are now, let the video record from the same spot through the whole procedure. Turns the lights on and wait 15 seconds, turn them off and unhook the aux from the battery. Then turn the lights on again for 15 seconds. You may be able to catch the degree of brightness change by doing that if there is one. Still, no idea why it would occur.
2013 JKU Sport, billet, auto, 3.73, LSD, 315/75/16 Duratracs on MB 72, 10A springs, Bushwacker flatties
Sold - 2005 TJ, red, auto, 3.73, 33" Duratracs, 4" lift
Ice storm casualty in 2007 - 2003 TJ, green, auto, 3.73, 33" Duratracs, 4" lift