Approximately 600 lumens brightness with dynamo power. Panasonic SKL083, new and unused. This light uses the rotation of the tire to generate power. Simply replacing your current light with this one enables automatic on/off (7-8 seconds after stopping). It also has a day/night switch, so you can use it as a safety light during the daytime. Although new and unused, it has been stored at home for a long time, so the packaging shows signs of aging.