Brighter than any LED in-lamp refit in a reverse light application. Most of the bright LED reverse replacement bulbs are considered very low duty cycle- they support less than 20 seconds operation time before they overheat. The rest of the bright LED lamps don't put light in good places on the reflector.
NONE of the 3156/7 style LEDs will exceed 500 lumens of output, even the ones claiming 1000 lumens (vleds, haha, bunch of 5630's wrapped around a chrome plated plastic cylinder))