Well this is interesting...

A meter of red LEDs and a meter of yellow LEDs, identical specs, on identical batteries.

The red LEDs went out after 10 hours, the yellow LEDs are still going after 15 hours.

Wat.

@yantor3d AFAIK, different color LEDs are made of different materials and thus surely have different characteristics.
@antopatriarca Yeah... but in another 30 minutes, the yellow LEDs will have lasted twice as long as the red LEDs. So I am starting to suspect the battery...
@yantor3d Or maybe a faulty strip of red LED