This is kinda odd. I thought lawn tractors ran the headlight bulbs off of AC from the generator. I know the AC is rectified and regulated to charge the battery. I had a couple of LED tail light bulbs left over from changing my Kia Soul to LEDs, and just for giggles I replaced the stock incandescent bulbs. I was pleasantly surprised to have them work perfectly. Maybe because of the hour meter needing DC to operate, someone at Husqvarna decided to tap into the same source and run the lights. In any case, I'm glad they work, and maybe someone here can use the information.