Hey guys just wanted to let you all know that I got the 2.4w SF501B 445nm Blue from sflasers,com and this thing kicks @$$. It looks like an infinite lightsaber at night. I went outside after dark around 9pm last night lit it up towards the sky and within seconds I had neighbors running over to my house to see what I had. You can feel the power in this thing when you hit the button. Truly phenomenal experience. Cant wait to see what else this laser can do.