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BUG Rating
Aug 11, 2017

BUG rating is Backlight, Uplight, Glare(BUG) rating of the luminaire.

BUG.png

 

The sum of percentages of lamp lumens within these three primary solid angles is equal to the

photometric luminaire efficiency.

Photometric Luminaire Efficiency (%) =

100 x { Forward Light (lumens) + Back Light (lumens) + Uplight (lumens) }/

total bare lamp lumens

Photometric Luminaire Efficiency (%) = Forward Light (%) + Back Light (%) + Uplight (%)

Trapped Light (%) = 100% Photometric Luminaire Efficiency (%)

 

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

- 2 -

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 5.7 mounting heights away from the luminaire.

 

TIM图片20170811172453.png

 

 

Backlight, Uplight, and Glare ratings may be used to evaluate luminaire optical

performance related to light trespass, sky glow, and high angle brightness control.

 

TIM图片20170811172600.png

 

 

Uplight Ratings (maximum zonal lumens)

 

TIM图片20170811172636.png

 

AOK iT Series led parking lot/area/shoebox light BUG rating as below:

 

75W  T3  BUG Rating     B2-U2-G2
110W T3  BUG Rating  B3-U2-G2 
150W T3  BUG Rating  B3-U2-G3 
180W T3  BUG Rating  B3-U3-G3 
225W T3  BUG Rating  B3-U3-G3 
265W T3  BUG Rating  B4-U3-G3 


 

75W  T4  BUG Rating     B2-U2-G1
110W T4  BUG Rating     B3-U2-G2  
150W T4  BUG Rating  B3-U2-G2 
180W T4  BUG Rating  B3-U3-G3 
225W T4  BUG Rating  B4-U3-G3 
265W T4  BUG Rating  B4-U3-G3 

 


75W  T5  BUG Rating  B3-U2-G1 
110W T5  BUG Rating  B3-U2-G2 
150W T5  BUG Rating  B4-U2-G2
180W T5  BUG Rating  B4-U3-G2
225W T5  BUG Rating  B4-U3-G4 
265W T5  BUG Rating  B5-U3-G4 

 

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