About 5 years ago, my parents bought me an awesome headtorch, which was 2 sets of 10 LEDs, providing 16 hours of battery life and relatively bright, alongside one halogen bulb (super bright!), with a battery life of around 5 hours.
The main drawbacks:
1. It was heavy (battery pack was 4 AA batteries)
2. It was no longer waterproof
On top of that, I lost it. At least, I thought I had until I bought this headtorch and pappa told me he had it...
Anyway, it led me to buy a new headtorch, the Petzl Nao. Super bright, two LEDs and "reactive lighting", which meant that there was a light-sensor, changing the amount of light being produced by the headtorch dependent on proximity of people, other sources of light etc.
Maximum 8 hours battery life, but it is so much lighter = big plus.
Strangely, I had to give it a software update, a first for me with a headtorch! I can't wait to try it out for real, which I'm sure will be sometime soon.