| 摘要 |
To aim to provide a lighting apparatus that is compact yet easy in lamp replacement. A lighting apparatus 1 comprises: a lamp 6 including an outer tube 13 and an arc tube 15 provided inside the outer tube 13; and an opening-type lighting fixture 3 having a mirror part 11 having a concave reflective surface 9 inside which the lamp 6 is disposed. The mirror part 11 reflects light emitted from the lamp 6 at the reflection surface 9 such that the reflected light is emitted through an opening 10 of the mirror part 11. Relational expressions 22≦̸r≦̸28, R≦̸130, and 3.5≦̸R/r are satisfied, with r denoting a maximum outer diameter [mm] of the outer tube 13, and R denoting an opening diameter [mm] of the mirror part 11.
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