The lumen might be a bit optimistic and the light will not hold a constant output for the full specified time, the "Burn time" is probably specified until it is impossible to see any light in the led.
yeah before this it was only 32 lumens. Now the Nemo 2410 change as well. From 60 something to 84 lumens now.. but the weird thing here is that the LED still remain a 1 watt LED. it should go higher i think if the lumens output were to be increased.