What is Forward Light?

File source—Illuminating Engineering Society of North America-IES TM-15-11

details of forward light

Forward Light

Forward light describes the lumen distribution in front of the luminaire. The forward light solid angle is defined between 0 and 90 degrees vertical, and 270 to 90 degrees horizontal in front of the luminaire. The forward light solid angle is further refined into four vertical secondary solid angles to evaluate the distribution of light in front of the luminaire. The forward light secondary solid angles (see Figure 3) are defined as follows:

  • Forward light low secondary solid angle (FL) – Percent lamp lumens between 0 and 30

degrees vertical (or luminaire lumens within that solid angle) in front of the luminaire. This is the light emitted from directly below the luminaire to 0.6 mounting heights away from luminaire.

  • Forward light mid secondary solid angle (FM) – Percent lamp lumens between 30 and

60 degrees vertical (or luminaire lumens within that solid angle) in front of the

luminaire. This is the light emitted from 0.6 to 1.7 mounting heights away from the luminaire.

  • Forward light high secondary solid angle (FH) – Percent lamp lumens between 60 and

80 degrees vertical (or luminaire lumens within that solid angle) in front of the

luminaire. This is the light emitted from 1.7 to 5.7 mounting heights away from the luminaire.

  • Forward light very high secondary solid angle(FVH) – Percent lamp lumens between 80 and

90 degrees vertical (or luminaire lumens within that solid angle) in front of the luminaire. This is the light emitted beyond 5.7mounting heights away from the luminaire.

File source—Illuminating Engineering Society of North America-IES TM-15-11

ROYAL’s adopts optical lenses provide light uniformity which optimizes the light’s light distribution and efficiency. AIKO solution offers reliable optical performance and durability for efficient light coverage in the most demanding situations. It can control the cut-off angle to prevent glare to the pedestrian or driver.

ROYAL LED STREET LIGHTING series

Lighting distribution of led street lighting

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