about 1.5 x brighter than the 2d halogen maglite . the 3d lead maglite be way brighter than either though . would like to get a bulb replacement for this one . battery life be only 11 hour ? since it be not a whole lot brighter than the 2d cell I be surprise by the short battery life . if you be not a security guard you 'll look like one carry this flashlight \/ baton . it be huge , which be probably the reason why you be buy it .