Led lights beat bulbs hands down in both power and efficiency. Led lights have also evolved towards a more natural spectrum of light - when you buy a quality light you won't be viewing the world in a pale blue light. When you go for an affordable model, the light is typically at its brightest with fresh batteries and then fades steadily. Modern, constant lighting options, however, allow you to keep the light on a set level for a certain amount of time. This is much better in active use such as hiking and mountain biking.