Streamlight ProTac, 1000 Lumens, Mount, Remote Switch, Black 88066 The ProTac Rail Mount HL-X is a 1"000 lumen weapon-mounted light featuring a dedicated fixed-mount for Picatinny rails. It uses either a remote switch with momentary/constant on operation or a standard push-button tail switch" and runs on either two CR123A lithium batteries or one Streamlight rechargeable 18650 battery.