Since the ARC "LS4" is delayed I'm getting an "L4" from Surefire. I didn't buy the Surefire previously because the ARC light had more of the features I wanted. With the delay, I want a powerful LED to play with until the ARC comes on line. I guess everyone wins: I have an excuse to buy the Surefire L4, Surefire sells me a light, ARC will still get my business, and I'll eventually have two excellent LED lights.