This is old information. The new LED's have gotten efficient enough that the size can be brought down to about the same size as an incandescent filament. I ran the old large format emitters for awhile and they weren't so great. I use them for my hi-beams now. The new ones I use for low beams now are muuch better.But not asshole bright so everyone flashes you. Like all the dumbasses that put LED bulbs in a normal reflector housing. Those people should be run off the road.