A light emitting device has a plurality of conductive members with good heat conductivity provided in a base member, the conductive members are isolated by insulating members provided between the conductive members. A light emitting element device is mounted on the base member. An light emitting diode is provided in the light emitting device and mounted on conductive member. A projection is outwardly projected from the heat conductive member for cooling the LED.

 
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> Device and method for emitting light with increased brightness using diffractive grating pattern

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