A lighting apparatus having a magnetron configured to generate microwaves, a waveguide including a wave guide space configured to introduce and guide the microwaves and an aperture to discharge the microwaves, a resonator to which the microwaves are transmitted through the aperture, and a bulb located in the resonator, the bulb encapsulating a light emitting material and configured to emit light based on the transmitted microwaves is provided. The apparatus also includes a reflective member or optical member located in the resonator such that light emitted from the bulb towards the aperture is reflected away from the aperture.