Abstract: A light source device, including a first light source, providing a first light beam in a first time period of a first period; and a second light source, providing a second light beam in a second time period of the first period, is provided. The first light beam and the second light beam have the same color temperature. The first light beam and the second light beam are emitted alternately in the first period, and a color rendering index of mixed light of the first light beam and the second light beam is greater than or equal to 85.

Abstract: An air conducting device includes a body, a baffle and a plurality of tongues. The body defines an airflow passageway therein. The baffle extends from the body to divide the airflow passageway into a first passageway and a second passageway. The first passageway is capable of receiving at least one first heat generating component therein. The second passageway is capable of receiving at least one second heat generating component therein. The first heat generating component is located in one of a plurality a slots. A plurality of tongues are located in the first passageway. Each tongue corresponds to the location of the plurality of slots. A guide channel is defined between every two adjacent tongues.