The Princeton Tec Shockwave L.E.D. Pack includes the Shockwwave LED which is the brightest 8-Cell light available, boasting 400 Lumens. It has a 12 hour burn time on high and 20 hours on low. It is equipped with 3 Max Bright LED´s that created a good spot, yet wide enough to light a large area. Also included in the Pack is an Impact XL L.E.D. which is a 1 Watt L.E.D. bulb. It has a Twist actuator (Twist-on bezel) prevents accidental powering on/off. This light has a battery life of 50+ hours. Last but not least the Pack includes a Eco Flare. The Eco Flare is a vital part of any night divers gear list. It can be used as a tank marker on continuous burn or as a single ultra bright red marker for boats, ascent lines and emergencies.