Semiconductor light radiation source with a base body (22) on which at least two LED chips (12, 14, 16, 18, 20) (Light emitting diode-chips) are fixed directly fixed by means of a thermally conductive connection on the base body (22) having at least one printed circuit board (46) mounted on the base body (22) extending from the LED chips (12, 14, 16, 18, 20) arranged in the central area outward to the perimeter zone of the base body (22) the LED chips (12, 14, 16, 18, 20) being arranged in the central area of the base body (22) according to a dense configuration being adjacent, without a plate of printed circuit (46) between them； the printed circuit board (46) reaching almost to the LED chips (12, 14, 16, 18, 20), practically up to a central circular ring shaped chip area characterized in that the printed circuit board (46) is extends adjacent to the chips and penetrates the free surfaces (36a, 36b, 36c, 36d) that extend laterally next to the LED chips (12, 14, 16, 18, 20) covering virtually the entire surface printed circuit board of the base body (22) except the surface occupied by the LED chips.Fuente de radiación luminosa de semiconductor con un cuerpo de base (22) en el que están montados directamente al menos dos chips LED (12, 14, 16, 18, 20) (Light emitting diode-chips) fijados mediante una unión térmicamente conductora sobre el cuerpo de base (22) habiendo montada al menos una placa de circuito impreso (46) sobre el cuerpo de base (22) que se extiende desde los chips LED (12, 14, 16, 18, 20) dispuestos en la zona central hacia fuera hasta la zona perimetral del cuerpo de base (22) estando dispuestos los chips LED (12, 14, 16, 18, 20) en la zona central del cuerpo de base (22) según una configuración densa quedando adyacentes, sin placa de circuito impreso (46) entre ellos； llegando la placa de circuito impreso (46) casi hasta los chips LED (12, 14, 16, 18, 20), prácticamente hasta una zona de chips con forma de anillo circular central caracterizada por que
