Abstract: A light curing device includes a housing module and a lighting module. The lighting module includes at least one light-emitting diode (LED), a driver, and a pulse width modulator. The LED is disposed at the housing module, and is configured to be driven to emit curing light. The driver is operable in an activated state. When in the activated state, the driver is operable to supply current to the at least one LED for driving the at least one LED to emit the curing light. The pulse width modulator is configured to output a pulse width modulation signal to the driver for controlling the driver to supply the current intermittently when the driver is in the activated state.