Lots of people seem to like the HC50 style, so don’t let me totally dissuade you… however, here’s some cut/paste from an older thread:
For what it’s worth, I run regularly with a few different headlamps.
- Petzl MYO RXP, probably about 180 grams, ~150 lumens, 3-AA on the back of the head. Nice and light, well balanced, but not very bright. (It used to be bright enough, but then I got others…)
- homemade QTC variable based on Lux-RC triple xpg and easy2led housing, around 310 grams, 700 lumens, 2-18650 on the back of the head. (subtract 60g for a single battery; subtract 135g if you’re carrying a battery on the hip). It’s a little hefty at full weight but 700 lumens is good and bright for just about anything — trails, streets, whatever.
- another homemade Lux-RC triple, custom housing, 225 g, 1400 lumens, 1- 18650 on the back. (add 60g for a second battery). Stupid bright on full, so high doesn’t actually get used much (except to try to attract attention at intersections). Very comfortable with one battery; not bad with 2. (155g without a battery if you run a battery pack on the hip, and although I expected it to be unbalanced, it runs pretty well.) Funnily enough, I’ve been enjoying strobe on this one for the early dawn when I don’t actually need light in front of me, but still need to attract the attention of drivers.
Sooo, if I was to get something new today, it would be something like 500-700 lumens, battery in the back/light in the front, and weigh under 250g (8oz).