| 摘要 |
PROBLEM TO BE SOLVED: To increase the excitation efficiency of a luminescent layer with a simple structure and obtain an afterglow quantity capable of sufficiently exerting the identifying capability of an object or a function as a guide light or an all-night light by forming a reflecting layer having the reflection factor of a specific value or above at a luminaire main body portion, and forming the luminescent layer containing phosphors having a long afterglow property on the reflecting layer. SOLUTION: A luminaire main body 1 has a U-shaped cross section, for example, and a reflecting layer R having the reflection factor of 70% or above is formed on the nearly whole face on the inner face side where the light of a fluorescent lamp 4 is radiated. A luminescent layer 2 containing phosphors 2A having a long afterglow property is formed on the surface of the reflecting layer R at least at the area of 50 cm<2> or above. The reflecting layer R side and nonreflecting layer side of the phosphor grains having a long afterglow property of the luminescent layer 2 of the luminaire main body 1 are excited by the direct light from the fluorescent lamp 4 and the reflected light on the reflecting layer R, the total excitation efficiency is increased, and the light radiation efficiency can be increased. |
