The UK SL4 Replacement Bulb is a 400 Lumens eLED lamp. The bulb has a beam distance of 622' (189.6 meters). Replacement bulb and reflector is for the Underwater Kinetic SL4 eLED Light (see SKU: UKTSL4E). Bulb makes a great save-a-dive-kit item. The dive you save may be your own!