I think the smallest 5w is made by the guy that makes all the small lights we want. Powered by 2 CR2s, it is definitly the smallest 5w I ever seen. Didnt have a KL1+E1e with me to compare, but it was definitly skinnier, and maybe a little shorter and way brighter. ( Post intentionally left vague so ''da man'' isnt flooded with emails!'')