Patent ID: 8540408

Claim:
A lamp light source, comprising: a light-emitting unit having a plurality of semiconductor light-emitting elements arranged as a ring on a front face of a mount so as to principally emit light in a frontal direction; a circuit unit converting externally-supplied electrical power to cause the semiconductor light-emitting elements to emit the light; an envelope including a globe that is diffusive, transmittant, and disposed so as to cover a front side of the light-emitting unit, and a base receiving the externally-supplied electrical power for causing the semiconductor light-emitting elements to emit the light; and a support member arranged at a distance from the light-emitting unit and supporting the circuit unit in relation to the envelope, wherein a through-hole is formed in the light-emitting unit so that the through-hole passes vertically through the light-emitting unit at a point inside the ring of semiconductor light-emitting elements, the circuit unit is at least partly arranged within the through-hole, a space is provided between the circuit unit and the light-emitting unit, and the support member forms at least part of a heat transmission pathway from the circuit unit to the base, the support member thermally connecting the circuit unit and the base.