Yup just by eye"difference in brightness" based on your subjective non-linear organic detectors (aka eyeballs), or something accurate? What is the current draw from their respective sources?
Could it be that your lights have a constant current driver? Or am I missing something obvious?
Pointing all five small Cree lights to the wall or ground in front of my feet in a darkened room with a variety of AA battery's and the 3 14500 trustfires.
Adding 2 different Efest's 14500 cells made it obviously way brighter.
Wouldn't a constant current driver not let that happen?