Light output, reported in lumens, is determined by the total amount of light coming out-the-front (OTF) of the flashlight, which is related to the LEDâs efficiency and how much power it uses. 500+ lumens Typical output of a ultra-high outputLED flashlight. 250-500 lumens Typical output of a high-output LED flashlight. 80-250 lumens Typical output of a mid-range LED flashlight. 20-80 lumens Typical output of a general purpose LED flashlight. Beam Intensity