A light apparatus with a hybrid power supply device and method utilizing the same are disclosed. The light apparatus includes an LED module, a solar module, an auxiliary power module, a voltage level detection circuit, a first switch unit, and a second switch unit. When a voltage of a solar electric power generated by the solar module is greater than a predetermined value, the voltage level detection circuit provides an electrical connection between the solar module and the LED module for enabling a transmission of the solar electric power to the LED module. When the voltage of the solar electric power is smaller than the predetermined value, the voltage level detection circuit provides an electrical connection between the auxiliary power module and the LED module for enabling a transmission of an auxiliary electric power generated by the auxiliary power module to the LED module.