For scientific purposes the light is claimed to put out 700 lumens in its highest setting. The whole setup weighs in at just over 520 grams (18.3 ounces), and it is waterproof to a reported 33 feet. It's built tough; the light's housing is actually metallic with fins to help cooling. Plus, a microprocessor inside controls the power based on the temperature, so with just a little cooling airflow the light brightens up after sitting still for a bit. This helps with the life of the LEDs. If you're worried about durability, Baja Designs warranties the whole system (less the battery) for life. The connectors are simple and weatherproof and stay connected without worry. The battery charges about as fast as it goes down, so a full charge takes about four hours. My experience, run in full power, is the light will easily last over two and a half hours and up to four. I never got a true reading since I'd switch to lower light levels when I thought battery life would be an issue. It's claimed the light will run for 12 hours in low mode. Unlike HID lights, turning the light on and off does not have consequences in battery life. There is a glowing light in the switch (green, yellow and red) that tells you the ballpark remaining run time of the battery, for peace of mind.