Same brand, same led, same output but different runetime. Why ?

Hello
i.m looking for two jeatbeam flashlight
Both use 2 AA with XP-G(R5) leds
PA20 230 lumens 1h30. / BA20 270 lumens 1h45 ???
PA20 16 lumens 26h30 / BA20 30 lumens 35h ???

PA 20 have better runetime with higher output. how it is possible?
thank you.

The batteries as tested might be different. BA20 has the better specs.

BA20 has specs with 2500mah batteries, PA20 has Eneloops with 2000mah.

Rob

"Runtime" is a tricky thing. Odds are great that both lights drop at least 10% output in the first minute just from heat. The driver can also play tricks to dim down in a way that is difficult to detect by eye (And won't matter for general use) but greatly extends runtime. The Mini Mag Lite AAA is a great example. You get about 70 lumens for a minute, and it drops gradually to 40 lumens. This is almost half the output, but only looks a bit dimmer to the eye. Most people won't notice it without comparing a 'fresh' MM AAA to a 'stale' one.

tl;dr, the ANSI runtime standard allows tricky lights that output 500 lumens for 3 minutes and 200 lumens for 2 hours to claim '2 hours x 500 lumen' runtime.