The CWL LED Tactical White Weapon Light for Long Guns from Crimson Trace gives you the lighting solution you need from a brand you trust. Available in two sizes, you can choose from the smaller 500 lumen, four-inch, four-ounce model, or the larger 900 lumen, 5.3-inch, five-ounce model. Whatever suits your use best, you can choose your best solution. The Crimson TraceA(R) CWL LED Tactical White Weapon Light for Long Guns use CR123 batteries in either configuration, so even if you choose a different model for different guns, your power source doesn't change. With the 900-lumen model you can expect almost 90 minutes of batter life, with 70 minutes for the 500-lumen option Mfg: Crimson Trace Corporation