Just my recent experience with LED lights. Driving home Friday night in weather in the teens and snowing hard, my light bar never iced up or lost brightness. This was on a 2 hour drive home on empty roads in BFE. It is a 30" DiodeDynamics amber light in combo spot/flood pattern mounted behind the grill. I also have a pair of Rigid D series SS pro lights in a white driving pattern mounted on A pillar mounts. Using the clear lights while driving in the snow was not good at all with the glare from the snow, the amber light bar was impressive. Due to the shitty weather I was only doing about 30-40mph and the amber bar had the distance for those speeds. Normally in clear weather I use the Rigids and they are damn impressive as far as distance and spread while driving at 65mph, I'd say on par with the Rigid 20" light bar I have on another truck. Neither of these brands are cheap like the Chicom shit, but in the 2 years I've been running them I have not had any issues.
These lights were on this truck. I have amber light covers on the cubes and no covers on the bar in this picture: