The light chain is 3 meters long and has 10 LED bulbs. This is a supplementary chain and comes without transformer and extension cord. The bulb itself in hard plastic and is 4 cm in diameter, and from the start of the socket to the end of the bulb there is 7 cm. The light chain for both indoor and outdoor use. The Lucas series can only be connected to Lucas supplementary chains, Lucas transformer and Lucas extension cords.