The Jet-μ is a beast on a 10440. Bought 2 because i wanted the driver in a tool ti. The driver did not fit, so ended up with 2 Jet-μ. Easy to mod both the jet-1 and Jet-μ. My jet-1 got a neutral xp-l hi, and one of my Jet-μ's got a nichia 219b for coulor, and the other a xp-g3 for more output. Dont like the jet-1 with a 14500, the pwm is bad, its great on a aa cell. But running the Jet-μ on a 10440, turns it into a epic flamethrower (no pwm). This little thing is silly bright on a 10440, been running it on a 10440 for some days now, not more than 30 sek on high mode, it gets hot fast. Im not going to put a aaa in the xp-g3 modded light. It's going to eat 10440's until it dies. So time will tell if it can survive on a 10440 in the long run