Metal vapor discharge lamp, floodlight projector and metal vapor discharge lamp lighting device

A metal vapor discharge lamp comprising:

• a refractory and light-transmitting hermetic vessel;
• a pair of electrode fixed to said hermetic vessel;
• a discharge medium sealed in the hermetic vessel, the discharge medium containing a first halide and a rare gas, the first halide containing a halide of at least one of sodium (Na), scandium (Sc) and a rare earth metal which radiate visible light (380-780 nm);
• and
• a ratio of visible-radiation power (380-780 nm) to near-infrared radiation power (750-1100 nm) falling within a range of 0.5:1 to 4.0:1, the visible-radiation power and the near-infrared radiation power being output when the metal vapor discharge lamp is in an ON state.