Admittedly, I'm an Olight fan.
This seems like an interesting product but I have no idea how well they'd preform on a firearm vs a Surefire or Streamlight.
http://www.olightstore.com/led-flash...-1-ii-valkyrie
ETA - quick specs
450 lumens/2,800 candela from a single CR123
1 hr runtime
$99
Sent from my iPhone using Tapatalk