| 摘要 |
An embodiment relates to a lighting device. The lighting device according to the embodiment comprises a first heat radiator including a first heat radiation part having a first thermal conductivity, and a second radiation part having the second thermal conductivity lower than the first thermal conductivity; and a light source module including a substrate and multiple light emitting devices arranged on the substrate, wherein the second heat radiation part comprises a connection part, an inner side part arranged on the connection part, and an outer side part arranged on the connection part and surrounding the inner side part, and the first heat radiation part includes the upper part in which the substrate of the light source module is arranged, and the lower part arranged on the connection part of the second heat radiation part and arranged between the inner side part of the second radiation part and the outer side part of the second radiation part. The length of the inner side pat of the second heat radiation part is less than the length of the outer side part of the second heat radiation part. The lighting device according to the embodiment reduces broken heat radiator caused by different heat conductivity or heat expansion ration of each of two or more materials, and reduces the material costs. |
