According to Sport Diver:
So super-roughly 96 - 101 lumens sustained (with a corresponding 10-15% decrease in battery life?)......
Rob
The technological breakthrough behind the C8 eLED Plus is its through-the-lens heat sink: for every one-degree drop in temperature, the light increases its lumen output by 2 percent. When immersed in water the heat is drained from the LEDs and improves the lumen rating of the unit by 10 to 15 percent. Offering more than twice the output of its predecessor (a maximum of 170 lumens), the C8 eLED Plus weighs in at a mere 39 ounces, runs up to ten hours, and is depth rated to 500 feet.
So super-roughly 96 - 101 lumens sustained (with a corresponding 10-15% decrease in battery life?)......
Rob