These stunning indoor amp outdoor string lights feature led bulbs cleverly shaped to mimic traditional christmas tree lights the extended reflector design makes the light from each bulb spread more evenly around than regular led bulbs and because they are leds the bulbs are both bright and also energy efficientr r led bulbs dont blow or need replacing like old bulbs and are far more energy efficient than traditional string light bulbs and typically last for a stunning 100 000 hours of cons