SureFire KL3 LED Conversion Head for 6P, C2, C3, D2, D3, G2Z, M2, Z2, Z3 flashlights KL3-BK-WH Fits 6P, C2, C3, D2, D3, G2Z, M2, Z2, Z3 flashlights Runtime: 19 lumens max output for 4.25 hours, followed by 4.75 hours of moderate output, followed by over 50 hours of minimum output C3, D3, Z3 Runtime: 19.5 lumens max output for 7 hours, followed by 8 hours of moderate output, followed by over 50 hours of minimum output. Construction - CNC machined aerospace-grade aluminum. Choice of black Type II anodized finish, or MilSpec Type III super-hard anodizing for corrosion and wear-resistance, light-focusing lens window Digital regulator circuitry ensures consistent light output for maximum duration, light output does not "drop off" like an unregulated LED Shock-proof Luxeon Star LED rated for thousands of hours of usage White for maximum brightness, high color temperature, and true-to-life colors