I had an arc LSH-s bought the arc LSH-P, sold the s version and sold my KL1 which I used with my E1E. The KL1 was too purplish and seemed about as bright as the arc but the arc beam was whiter and just nicer to look at. As a matter of fact, I bought a County comm $70 ARC LSH-s just of the heck of it to keep in one of my cars. I love the nature of the white arc beam, surefire should have done better, but I'm glad arc is.