Abstract: A light assembly includes an attaching member having a chamber for attaching onto an object and having two couplers, two electric cables engaged in the attaching member and each having two end terminals disposed in the couplers, a light device and a power supply device each include a latch device for engaging with the couplers and for attaching to the couplers of the attaching member, and each having two connectors for electrically connecting to the terminals of the electric cables and for electrically connecting the light device to the power supply device, and for allowing the light device and the power supply device to be easily and quickly attach to and disengaged from the attaching member without external wires.