This thesis focuses on the design and implementation of an economical and energy efficient DC Light Bulb for the DC House Project. For the DC lighting system, emphasis is on the DC-DC LED driver, dimmer circuit, LED lighting array, and physical packing design. In this paper, a DC Light Bulb is designed, simulated, and tested to operate at a wide input voltage ranging from 24 VDC to 72 VDC, to be fully dimmable using pulse-width modulation technique, and to produce lumination intensities equivalent to a standard 100 W A19 incandescent light bulb at one-tenth the total power consumption. The DC Light Bulb’s physical design also takes advantage of the same physical dimensions of a standard A19 incandescent light bulb using an E26 Edison screw base. Results from computer simulations and hardware tests demonstrated the feasibility of the proposed DC Light Bulb in terms of overall efficiency, line regulation, load regulation, power consumption, total lumens, luminous efficacy, and thermal profile.