Pros: Bulb Durability, Battery Life, Durability, Brightness
Great in Fenix variable brightness lights.
I recently purchased 2 Fenix LED lights with variable brightness settings. On high setting the brightest of the 2 lights will drain a set of 2 batteries in 1 hour and 10 minutes. However with reasonable use of the high power setting these batteries are champs. I have yet to replace either of the batteries in the 2 flashlights. I am a security officer and depend on a durable light and battery combination. Thr Surefire batteries and Fenix variables meet my requirements very nicely.