The fuel features three super bright nichia led lights which can be opareted in four lighting modes to vary light intensity and battery lifer r using a single button you can switch the lamp on and cycle through four lighting modesr high power illuminating the leds to full power and blasting a 15 lumen beam of light up to 26m ahead of course working at full power will drain the batteries over 50 hours yes that is over two days constant illuminationr r medium power will increase battery