
Originally Posted by
mushroom_toy
[0007] SAE Standard J1383 also specifies certain requirements for vehicular lamps functioning as headlamps, including minimum and/or maximum luminous intensity requirements. According to the aforementioned standards, a minimum and/or maximum luminous intensity must exist at various points in the illumination zone to be in compliance. These specific photometric requirements for vehicular low beam and high beam headlamps, as set forth in SAE Standard J1383, are included hereinbelow. TABLE-US-00001 TABLE 1 PHOTOMETRIC SPECIFICATION - LOW BEAM Low Beam Minimum (cd) Maximum (cd) 10U to 90U, 45.degree. R to 45.degree. L 125 8L to 8 R, H to 4U 64 4L to 4R, H to 2U 125 1U to 11/2 L to L 700 1/2U to 11/2L to L 1000 1/2D to 11/2L to L 3000 11/2U to 1R to R 1400 1/2U to 1R, 2R, 3R 2700 1/2D to 11/2R 8000 20000 1D to 6L 750 11/2D to 2R 15000 11/2D to 9L and 9R 750 2D to 15L and 15R 700 4D to 4R 8000
[0008] TABLE-US-00002 TABLE 2 PHOTOMETRIC SPECIFICATION - HIGH BEAM High Beam Minimum (cd) Maximum (cd) 2U to V 1500 1U to 3R and 3L 5000 H to V 20000 75000 H to 3R and 3L 10000 H to 6R and 6L 3250 H to 9R and 9L 2000 H to 12R and 12L 500 11/2D to V 5000 11/2D to 9R and 9L 1500 21/2D to V 2000 21/2D to 12R and 12L 750 4D to V 12500 Maximum Beam Candela.sup.(1) 30000 .sup.(1)The highest candela reading found in the beam pattern
[0009] SAE J578, entitled "Color Specification", sets forth the definition for white light as applied to headlamps. The definition applies to the overall effective color of light emitted by a headlamp in any given direction and not to the color of the light from a small area of the lens. In SAE J578, the fundamental requirements for color are expressed as chromaticity coordinates according to the CIE (1931) standard calorimetric system.
[0010] Pursuant to SAE J578, the following requirements for white light shall apply when measured by the tristimulus or spectrophotometric methods, as are well known in the art. TABLE-US-00003 TABLE 4 WHITE LIGHT (ACHROMATIC) The color of light emitted from the headlamp shall fall within the following boundaries: x = 0.31 (blue boundary) x = 0.50 (yellow boundary) y = 0.15 + 0.64x (green boundary) y = 0.05 + 0.75x (purple boundary) y = 0.44 (green boundary) y = 0.38 (red boundary)