For street lights, our product datasheet includes three characteristic angles: Longitudinal Angle, Lateral Angle, and Asymmetry Angle, as shown in the light distribution curve below — 150°, 62°, and 15°, respectively.

• Longitudinal Angle (150°):
  The longitudinal angle refers to the direction along the road length. According to the European standard, it is defined as the angle between the two intersection points of the half maximum luminous intensity line and the longitudinal light distribution curve.
  In the figure, the green line represents the longitudinal distribution curve, where the maximum luminous intensity is approximately 440 cd. The half-intensity value is 220 cd, and the curve intersects this value at two points (marked by red arrows) — each at 75°. Therefore, the longitudinal angle is 150° (75° + 75°).

• Lateral Angle (62°):
  The lateral angle refers to the direction along the road width, and is determined using the same method as the longitudinal angle.

• Asymmetry Angle (15°):
  The asymmetry angle represents the tilt or offset of the luminous distribution. It is defined as the angle between the 0° vertical axis and a line passing through the center point (the optical center) that divides the enclosed area of the lateral light distribution curve (blue line) into two equal parts.
  This line (shown in pink) corresponds to an angle of 15°, indicating that the light distribution is slightly shifted by 15° from the vertical axis.

• Optical Advantages — Shenzhen Vbritlight

  Vbritlight offers a wide range of lens angle options to meet diverse lighting requirements for different road and project conditions.
  Our lenses feature high light transmittance and are available in two material types —glass lenses street lighting and PC lenses street lighting, each providing excellent optical performance and durability.

  We can deliver customized optical solutions tailored to specific applications, helping customers achieve the best balance between lighting efficiency, uniformity, and visual comfort.
  In addition, Vbritlight provides professional lighting design services, ensuring optimal illumination distribution and energy efficiency for every project.