Lamp

A lamp comprising:

• a primary reflective mirror being bowl-shaped with an opening at one end, and having an inner surface serving as a reflective surface;
• a base provided at another end of the primary reflective mirror;
• semiconductor light-emitting elements disposed within an envelope composed of at least the primary reflective mirror and the base;
• a circuit unit configured to receive power via the base and cause the semiconductor light-emitting elements to emit light;
• and
• a secondary reflective surface configured to reflect light emitted from the semiconductor light-emitting elements toward the reflective surface of the primary reflective mirror, wherein
• at least part of the circuit unit is disposed within the primary reflective mirror closer to the opening than to the base in a direction in which the semiconductor light-emitting elements emit light, and
• the secondary reflective surface is located between the at least part of the circuit unit and the semiconductor light-emitting elements, and reflects light, emitted from the semiconductor light-emitting elements to the at least part of the circuit unit, toward the reflective surface of the primary reflective mirror.