| 摘要 |
PROBLEM TO BE SOLVED: To minimize the leak of light with a simple structure and release the heat generated from a fluorescent tube to efficiently light the fluorescent tube. SOLUTION: An air passing route 24 extending from the housing space 11 of a shade 12 to the upper part of the shade 12 through a vent hole 21 is formed, and the high-temperature air within the housing space 11 is released to the upper part of the shade 12 through the air passing route 24. According to this, the air temperature in the housing space 11 and, in its turn, the temperature of the fluorescent tube 15 itself can be reduced with hardly leaking the light emitted from a fluorescent tube 15 to increase the energy efficiency of the fluorescent tube 15. |
