Viridian Weapon Technologies 4LUX 2K, Handstop with Light, M-LOK Mounting, Black, 2000 Lumens 912-0089 Viridian is proud to announce the 4LUX 2K" the Ergonomic Forward Grip with Integrated Close Quarters Tac light. The 4LUX 2K provides excellent ergonomics with a built in 2000 Lumen LE which is specifically designed to maximize flood for combat situations