• Handy-sized 3 watt back-up torch with effective illumination.
• Specially designed switch lock system prevents accidental activation.
• Double o-ring seal provides extra security against leakage.
• Quick and easy battery replacement.
• Strong plastic casing.
• CE approved.

2011 ScubaLab Dive Lights: Tester's Choice

Burn time: 8 hours Weight: 13.5 oz.

A slick pocket light, the IST Sports T-16 LED Sunny requires only three batteries (IST provides a fourth “dummy” battery with each light). This makes the Sunny more economical to operate, while still delivering more burn time than many other lights that also run on four C batteries. Recording the second-highest EV reading in its class, this pocket torch generates a very hot spot beam 13 inches in diameter, surrounded by a very bright, wide halo that reaches out more than three feet from center, providing lots of periphery illumination. It’s almost like a combo spotlight and floodlight. The light head and battery casing are protected from the elements with a double O-ring seal. The swivel-lever switch can be activated one-handed, and it comes with a safety lock. The Sunny is depth rated to 200 feet and comes with a wrist lanyard. Note: Remember to use the dummy battery; using four C batteries can damage the circuit. 

Sorce: http://www.scubadiving.com/gear/accessories/pocket-lights-ist-sports-t-16-led-sunny