TM-15-07 BUG Ratings Addendum

TM-15-07 BUG Ratings Addendum
Addendum A for IESNA TM-15-07: Backlight, Uplight, and Glare (BUG) Ratings
The following Backlight, Uplight, and Glare ratings may be used to evaluate luminaire
optical performance related to light trespass, sky glow, and high angle brightness
control. These ratings are based on a zonal lumen calculations for secondary solid
angles defined in TM-15-07. The zonal lumen thresholds listed in the following three
tables are based on data from photometric testing procedures approved by the
Illuminating Engineering Society for outdoor luminaries (LM-31 or LM-35).
Table A-1: Backlight Ratings (maximum zonal lumens)
Backlight / Trespass
Backlight Rating
Secondary
Solid
Angle
B0
B1
B2
B3
B4
B5
BH
110
500
1000
2500
5000
>5000
BM
220
1000
2500
5000
8500
>8500
BL
110
500
1000
2500
5000
>5000
Table A-2: Uplight Ratings (maximum zonal lumens)
Uplight / Skyglow
Uplight Rating
Secondary
Solid
Angle
U0
U1
U2
U3
U4
U5
UH
0
10
100
500
1000
>1000
UL
0
10
100
500
1000
>1000
FVH
10
75
150
>150
BVH
10
75
150
>150
1
Table A-3: Glare Ratings (maximum zonal lumens)
Glare / Offensive Light
Glare Rating for
Asymmetrical Luminaire Types (Type I, Type II, Type III, Type IV)
Secondary
Solid
Angle
G0
G1
G2
G3
G4
G5
FVH
10
250
375
500
750
>750
BVH
10
250
375
500
750
>750
FH
660
1800
5000
7500
12000
>12000
BH
110
500
1000
2500
5000
>5000
Glare / Offensive Light
Glare Rating for
Quadrilateral Symmetrical Luminaire Types (Type V, Type V Square)
Secondary
Solid
Angle
G0
G1
G2
G3
G4
G5
FVH
10
250
375
500
750
>750
BVH
10
250
375
500
750
>750
FH
660
1800
5000
7500
12000
>12000
BH
660
1800
5000
7500
12000
>12000
2
Notes to Tables A-1, A-2, and A-3:
(1) Any one rating is determined by the maximum rating obtained for that table. For
example, if the BH zone is rated B1, the BM zone is rated B2, and the BL zone is
rated B1, then the backlight rating for the luminaire is B2.
(2) To determine BUG ratings, the photometric test data must include data in the
upper hemisphere unless no light is emitted above 90 degrees vertical (for
example, if the luminaire has a flat lens and opaque sides), per the IES Testing
Procedures Committee recommendations.
(3) It is recommended that the photometric test density include values at least every
2.5 degrees vertically. If a photometric test does not include data points every 2.5
degrees vertically, the BUG ratings shall be determined based on appropriate
interpolation.
(4) A “quadrilateral symmetric” luminaire shall meet one of the following definitions:
a. A Type V luminaire is one with a distribution that has circular symmetry,
defined by the IESNA as being essentially the same at all lateral angles
around the luminaire.
b. A Type VS luminaire is one where the zonal lumens for each of the eight
horizontal octants (0-45, 45-90, 90-135, 135-180, 180-225, 225-270, 270315, 315-360) are within ±10 percent of the average zonal lumens of all
octants.
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“BUG” RATING EXAMPLE:
A 250-watt MH area luminaire, Type IV forward throw optical distribution.
Based on the photometric test data, the luminaire has the following zonal
lumen distribution:
Forward Light
FL
(0 - 30 degrees)
FM (30 - 60 degrees)
FH (60 – 80 degrees)
FVH (80 – 90 degrees)
Back Light
BL (0 – 30 degrees)
BM (30 – 60 degrees)
BH (60 – 80 degrees)
BVH (80 – 90 degrees)
Uplight
UL (90 – 100 degrees)
UH (100 – 180 degrees)
Lumens
1618
6093
3748
27
% Lamp Lumens
5.9%
22.2%
13.6%
0.1%
985
930
136
16
3.6%
3.4%
0.5%
0.1%
0
0
0.0%
0.0%
Backlight Rating:
Determine the lowest rating where the lumens for all of the secondary solid angles do
not exceed the threshold lumens from Table A-1. In this example the backlight rating
would be B2 based on the BL lumen limit.
Uplight Rating:
Determine the lowest rating where the lumens for all of the secondary solid angles do
not exceed the threshold lumens from Table A-2. In this example the uplight rating
would be U1 based on the FVH and BVH lumen limits.
Glare Rating:
Determine the lowest rating where the lumens for all of the secondary solid angles do
not exceed the threshold lumens from Table A-3 for a Type IV distribution. In this
example, the glare rating would be G2 based on the FH lumen limit.
Therefore, the BUG rating for this luminaire would be: B2 U1 G2
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