Lamp light source with improved heat dissipation

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 throughout an entire area between the circuit unit and the light-emitting unit, the space completely separating 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.