| 摘要 |
PURPOSE:To efficiently impart the uniform and optimum illuminance distribution to a growing plant on a plant cultivation plate by providing the top side of the plant cultivation plate with long luminous tubes arranged in the horizontal direction and a parabola-shaped reflecting plate covering each luminous tube. CONSTITUTION:Each long luminous tube 14 is arranged parallel to the surface of a plant cultivation plate 8 and in the horizontal direction. The top of the luminous tube is covered with a reflecting plate 15 having a parabola-shaped cross section at right angles to the longitudinal direction of the luminous tube. When the distance between the luminous tube and the deepest part of the reflecting plate is L, the luminous tube is installed within the range of + or -L/2 with the line connecting mutual ends of the reflecting plate as the center. |
