A lighting apparatus using microwave comprises: a waveguide for
transmitting microwave generated in a magnetron; a mesh screen installed
on an outlet portion of the waveguide for blocking a leakage of the
microwave and passing light; a bulb located in the mesh screen for
emitting light by the microwave; a dielectric mirror installed on the
outlet portion of the waveguide for reflecting the light emitted in the
bulb forward parallelly; and a reflector installed around the mesh screen
for reflecting the light emitted in the bulb forward, and the reflector
and the dielectric mirror are constructed so that the light generated in
the bulb can be radiated as parallel ray, whereby loss of light can be
minimized and lighting efficiency can be improved.