The infectious light set is composed of a couple of mother light bulbs and baby light bulbs. The mother light bulb is used to control and “infect” the baby light bulbs. As the mother light bulbs approach, the baby light bulbs could be lightened with the same color as the mother light bulbs. The infectious light set can work together as a lamp or as many spreading light bulbs. There is only a single charging equipment in need. Once the baby bulbs are being spread out around in the room, they would be lightened up if the mother light bulbs are nearby.