The lighthouse desk light is a compact foldable super bright light with 30 smd leds that can provide up to 100 lumens of output two levels of illumination are available of either 100 or 50 the lamp has a fully adjustable arm that allows the best position to be set to suit the users needs for added versatility the lamp can be run for up to nine hours using the supplied 4 x aaa batteries or from any convenient usb outlet such as a laptop or pc using the supplied power lead please note rechargeable