| 摘要 |
PURPOSE: To efficiently stimulate the growth of plant with light by attaching a light source inside a housing having upper and lower air ventilation opening parts and a sidewall plate part having an inner reflecting plane. CONSTITUTION: Light sources 22, 24 and 26 are provided in a space 18 of housing 12 composed of a lower part 14, upper part 16 and plural sidewall plate parts 28, 30, 32, 34, 36 and 38 having inner faces 40, 42, 44, 46, 48 and 50 equipped with vacuum evaporation layers, and the leakage of light is prevented by forming a bent upper end part inside this housing 12. Then, a lower air ventilation opening part 52 surrounding the lower part 14 of the housing 12 and an upper air ventilation opening part 54 surrounding the upper part 16 are formed and air is circulated through the space 18. |
