Lamp provided with thin film for reflecting infrared rays.

摘要

A lamp is provided on the surface of its glass bulb with a multi-layer film comprising an alternate laminate of at least one dielectric layer (8) of a higher refractive index and at least one dielectric layer (9) of a lower refractive index, so as to transmit visible rays radiated from a light source (1) and to reflect infrared rays radiated from the light source (1), wherein a low transmittance range with a transmittance of 10 to 40% is provided in a visible region.