Today I got my new i5T in the mail. This is OLight's first AA flashlight. Anyone familiar with the i3T will recognize the resemblance (that's the i3T at the top, i5T on the bottom.
Specifications for both are: i3T i5T
LOW 5 lumens 15 lumens
16 hours 20 hours
HIGH 180 lumens 300-150-30 lumens
21 minutes 3- 25-122 minutes
They both feature the same clicky low-high interface with momentary on, and the same bi-directional pocket clip.
The specifications for the i5T for High emphasize what I've long thought about some of the OLight offerings: they need a Medium setting. The i5T has four different lumen outputs, why not allow the user to cycle through all four brightness levels? That issue aside, I'm happy with my new acquisition.