I purchased several of these drivers to build 1x18650 lights.
I hooked one up on the bench today and at 4.2V I only get about 700ma instead of 1.4A. The input voltage is 2.8-6v. If I crank up the power supply to 6 volts I can get (near) the full output. I forget the exact number. However, et occurs to me that this relationship (input volts/output amps) might be very logical.
I'm relatively new to this, so should I expect that you have to drive it at 6v to get the 1.4A? I had assumed that any voltage in the stated input range would deliver the full current.