Abstract: The lamp includes a cap engaged to a bulb composed of a glass lens and a glass reflector, the lens and reflector each having an inner surface which is parabolically shaped and coated with an IR reflective material layer. The interior configuration of elements of the lamp is mathematically molded to cause infrared rays emitted by the filament to evenly reflect back to the filament heating same and thereby increasing lighting efficiency up to 50%, with the lamp emitting cool light and without compromising longevity of the lamp. The lamp may be any of a plurality of diversified types, such as high pressure sodium, metal halide, incandescent, halogen, etc.