This lamp illuminates more than my bike! I am very satisfied with the product, the value for money is excellent. The lamp comes with a partial refill lasts about 1 hour. By cons, once the full charge, I 2h30 of battery life at full power (for an outside temperature of 12 degrees). FYI, a green light on the back turns red when the battery charge gets weaker. It should then move the lamp to reduced power. The tie to secure the bike is average, I suggest you place a pipe insulation tube on the handlebars. You can more easily direct the light according to need during your bike ride, and the lamp will also undergo fewer shocks.