I have 2 very similar. Mine were listed at 400 lumen and single AA battery. I wouldn't say it was 400 lumen, but 2 of them are plenty bright riding on a rail trail. The problem was, half hour out at dusk while I had them turned on, the ride back was in darkness because the battery only lasted half an hour. Luckily it was a full moon and fall so there weren't any leaves on the trees to block the moonlight. I would have been walking 6 miles back if it wasn't a full moon out.