2 the axial luminous intensity of daylight signalling lamps should reach at least 90 % of the maximum luminous intensity 白昼信号灯的轴向发光强度至少应达到最大发光强度的90 % 。
3.
3 the luminous intensity of daylight signalling lamps should have its maximum in the centre of the luminous intensity distribution . it should decrease evenly from the centre of luminous intensity distribution 白昼信号灯的发光强度最大值应位于发光强度范围的中心，并应均匀地自中心向发光强度范围内减少。
