CREE LEDs are especially popular for use in flashlights， and powerful white LEDs are replacing incandescent bulbs in practical flashlights at an increasing rate. LEDs can be drastically more efficient than incandescent flashlights as white LEDs produce about 500 lumens per watt， compared with the 8 to 10 lumens per watt of small incandescent bulbs. Due to the LEDs’ long lifespan， a LED flashlight will have a longer battery life than a comparable output incandescent flashlight. As LEDs are more durable and less fragile than glass lamps， it seems to be another reason why they are a popular choice to be used in flashlights.