Originally Posted by
znomit
Ponder this, they both have about the same battery power (1AA = 2AAA) but the Mars runs 50hrs and the cateye 4hrs.
The Mars is currently my favorite light. Mainly because on the weekend I got lost in the bush, ended up swimming down a river with the bike, and the I had to use the mars to find my way down the river and out through the forest.

The Mars will not run 50 hours, it's closer to about 8 to 10 hours on constant. Blackburn lied big time about their battery run times. They were about 80% off on their estimates. I have a Cateye LD600 and that thing lasts about 20% longer then Cateye estimated; whereas with Cygolite (at least their headlight burn times) have been very accurate for the 3 models that I own. So I'm not sure if any advertised run times by any manufacture is a indication of much of anything.