In the description of an unusual experiment published in Physical Review Letters you may read about the invention of a lamp possessing the unbelievable coefficient of performance that exceeds 100 %. The Law of conservation of energy wasn’t violated however. The matter is that is wasn’t the usual electric incandescent lamp but the device that is similar to semiconductor radiation emitting diode. The astonishing effect of the great performance coefficient was achieved while this device was working in the mode of the lowest radiation and the highest temperature.