| 摘要 |
PURPOSE: To increase a rate of a light flux incident on a surface to be illuminated, and perform illumination excellent in a coefficient of utilization by straining light distribution of an HID floodlight luminaire in both the vertical angle direction and the horizontal angle direction. CONSTITUTION: A maximum luminous intensity point exists in the optical axis center, and luminous intensity not less than the vertical angle 10 deg. direction from the maximum luminous intensity point is cut, and luminous intensity not more than the vertical angle -45 deg. direction from the maximum luminous intensity point is cut, and luminous intensity not less than the horizontal angle 45 deg. direction from the maximum luminous intensity point is cut, and a beam light flux in a vertical angle±5 deg. and a horizontal angle±5 deg. from the maximum luminous intensity point is set so as to have light distribution not less than 54% of the light flux of a luminaire. Luminous intensity not less than the 5 deg. direction is cut, and luminous intensity not more than the vertical angle -30 deg. direction from the maximum luminous intensity point is cut, and luminous intensity not less than the horizontal angle 45 deg. direction from the maximum luminous intensity point is cut, and a beam light flux in a vertical angle±20 deg. and a horizontal angle±20 deg. from the maximum luminous intensity point is set so as to have light distribution not less than 78%, of the light flux of the luminaire. |
