The Streamlight Polytac LED HP Black has C4 LED technology with a 50,000 hour lifetime. The lens is made of unbreakable polycarbonate with scratch resistant coating. There are 3 hours of continuous runtime to the 10-percent output level.
 
Additional Information
50,000 hour lifetime
Borofloat glass lens, o-ring sealed
"Tail cap push button provides one handed momentary or constant ""on"""
3 hours of continuous runtime to the 10-Percent output level
Two (2) 3-Volt CR123A lithium batteries with a shelf life of 10-Year