AE-DS1
Introduction
Light pollution caused by some outdoor lighting, is a major concern for a growing number of cities, states,
environmental organizations, and even the Federal Government. The primary concerns are glare, light
trespass, and light pollution in the upper hemisphere commonly referred to as "sky glow".
Sky glow is the haze or "glow" surrounding cities or heavily populated areas. It is the result of uncontrolled
and reflected light being directed into the sky and illuminating dust or other atmospheric particles.
Astronomers, certain organizations, and private citizens argue that the increasing sky glow is reducing their
ability to view the night skies. Outdoor lighting, when improperly specified and applied, can be a significant
factor in increasing the amount of light pollution and sky glow.
Most people agree that preserving the darkness of the night sky is a worthy goal. However, safety,
security, maintenance costs, the efficient use of energy, and architecture are also important when
considering outdoor lighting. The ideal situation is one where all the factors can be considered and
balanced to achieve good results in all areas.
The Illuminating Engineering Society of North America (IESNA) has established classifications for outdoor
lighting fixtures that can help designers and specifiers consider the amount of light that is wasted into the
night sky. These classifications are: Full Cutoff, Cutoff, Semi-Cutoff and Non-Cutoff. The percentage of
lamp lumens allowed into the upper hemisphere ranges from 0% with a Full Cutoff rating to unrestricted
with a Non-cutoff rating. However, light also reacts with the reflective properties in its surroundings that
contribute to light pollution. Therefore, it is not necessarily correct to choose a luminaire based on IES
cutoff classification alone.
The idea that a Full Cutoff luminaire is always the best choice for preserving the night sky, or that it is the
most "Dark Sky Friendly" fixture, is simply not true. When factors such as pole spacing, the total number of
poles required, and the typical ground reflectance are considered, the most "Dark Sky Friendly" fixtures
often times turn out to be well designed Cutoff or Semi-Cutoff luminaires.
At Amerlux Exterior, we manufacture a variety of luminaires in each classification, and many different
architectural styles. This brochure highlights only the luminaires that achieve Semi-Cutoff or greater. The
important thing to remember is that many factors go into choosing the right fixture for the specific job. Our
skilled sales representatives are ready to help you decide which luminaire meets all the criteria that are
important to you, the project, and the community.
5220 Shank Road
Pearland, Texas 77581
800.364.0098
Fax: 281.997.5441
www.amerluxexterior.com
3. IES Classifications
5. Weighing the Options
7. Optical Systems
8. Full Cutoff Fixtures
9. Cutoff Fixtures
14. Semicutoff Fixtures
15. Ordering Guide
IES Cutoff Classifications
2.5%
90°
10%
80°
0%
90°
10%
80°
Cutoff
Max. 2.5% lamp lumens above 90°
Max. 10% lamp lumens between 80° and 90°
Full Cutoff
Max. 0% lamp lumens at or above 90°
Max. 10% lamp lumens between 80° and 90°
5%
90°
20%
80°
Semicutoff
Max. 5% lamp lumens above 90°
Max. 20% lamp lumens between 80° and 90°
Amerlux Exterior Global Lighting Solutions
5220 Shank Road
90°
Non Cutoff
No restriction of lamp lumens at any angle/
Pearland, Texas 77581
800.364.0098
Fax: 281.997.5441
www.amerluxexterior.com
Although IES cutoff classifications give some indication of how "dark sky friendly" a fixture is, it doesn't tell the whole
story. As illustrated in Weighing the Options (page 4), the IES Cutoff Classification does not consider environmental
reflectance or overall efficiency of the luminaire, which could lead to adding more poles to meet minimum lighting
requirements.
Additionally, safety, uniformity, and the ability to adequately illuminate vertical surfaces are not covered by the IES Cutoff
classification. Items like these require that the designer look at many factors related to the specific fixture and the
project as a whole.
The chart below illustrates several key points relevant in the discussion of balancing Dark Sky Friendly fixtures with other
criteria for a project. The UWLR (Upward Wasted Light Ratio) is the actual amount of light that is wasted above the 90
degree plane from the luminaire as a whole, not just the percentage of the lamp. Notice that while all Full-Cutoff
Luminaires will have a UWLR of 0%, the Cutoff classification has a wide range. Some are very close to 0% (.0663)
while another could approach 15% and still be classified as Cutoff. Also while most would want to avoid a large amount
of light in the 80 to 90 degree Glare Zone, a higher Maximum Candela Vertical Angle generally means further pole
spacing and less energy consumption.
The data shown below is just a small sample of all that is available on most fixtures. When careful consideration is given
to all important criteria, the suitable pole / luminaire combination can be found.
Fixture
Cutoff Classification
IES Classification
Longitudinal Classification
Maximum Candela
Max. Candela Vert. Angle
Max. Candela at 90º Vertical
Max. Candela 80º to < 90º Vert.
Zonal Lumens: 80-90
Zonal Lumens: 90-180
Total Zonal Lumens
Total Luminaire Effeciency
Total Downward Efficiency
UWLR
Avg. Glare Zone Max Luminous
Intensity 80-90 (% of lamp
luminous flux)
D135/AO21PC-CL (L5) D138/AR18GL-T5 (FDR)
Cutoff
Non-Cutoff
Type V
Type V
Short
Long
2770
877
55
90
206
877
(1.47% of lamp lumens)
(9.23% lamp lumens)
455
872
(3.25% lamp lumens)
(9.18% lamp lumens)
328.766
918.948
695.556
3170.836
7362.451
6280.81
53%
66%
47.62%
32.74%
9.45%
50.49%
3.25%
9.18%
4
D242 (HR)
Cutoff
Type IV
Short
2865.96
60
138.87
(.99% lamp lumens)
314.3
(2.24% lamp lumens)
134.017
47.7
7200
51.00%
51.04%
.663%
D142/RFS22 (HR)
Full Cutoff
Type III
Short
3085.45
60
0.0
(0% of lamp lumens)
160.28
(1.14% lamp lumens)
53.319
0
10337.289
74.18%
74.18%
0%
2.24%
1.14%
Weighing the Options
Actual rendering using AGI32 of theoretical scenario using 12' poles and fixtures
of various cutoff classifications.
Full Cutoff
Features
- Direct light is thrown below the
horizontal plane
- Efficient target output
Considerations
- Reduced pole spacing, more
poles needed to acheive
desired output
- Increased energy usage and
maintenance
- May create "hot spots"
- Reflected "ground glare"
resulting in sky glow
- Less uniformity than Cutoff
- Low vertical illumination
Skyglow Stats.
Max: 0.4
Min: 0.1
Avg: 0.25
Skyglow stats. are key illuminance values (measured in footcandles) on a calculation plane located
60ft. above the ground.
Cutoff
Features
- Less than 2.5% lamp lumens
above the horizontal plane
- Permits wider spacing
between poles, resulting in
fewer poles and less indirect
uplight
- Efficient lighting with minimal
contribution to light pollution
- Limits light tresspass/spillover
- Higher vertical illumination
than full cutoff
Skyglow Stats.
Max: 0.3
Min: 0.0
Avg: 0.15
Considerations
- Will allow some uplight
- May create "hot spots", safety
considerations
Amerlux Exterior Global Lighting Solutions
5220 Shank Road
Pearland, Texas 77581
800.364.0098
Fax: 281.997.5441
www.amerluxexterior.com
Semicutoff
Features
- Less than 5% lamp lumens
above the horizontal plane.
- Typically mounted at wider
spacings, reducing cost in
overall power consumption and
using fewer poles than other
classifications
- Higher vertical illuminance for
safety, security, and eye comfort
- Greater uniformity
Skyglow Stats.
Max: 0.4
Min: 0.1
Avg: 0.24
Considerations
- More uplight than cutoff or full
cutoff classifications
- Less control of
tresspass/spillover than cutoff
or full cutoff classifications
Non Cutoff
Considerations
- Glare
- Limited or no light control
- Highest vertical illumination
Skyglow Stats.
Max: 0.9
Min: 0.2
Avg: 0.5
Skyglow stats. are key illuminance values (measured in footcandles) on a calculation plane located
60ft. above the ground.
6
Semicutoff
SLL
FDR
The FDR is a hydro-formed and brightly polished reflector that
utilizes a vertical lamp (base down or base up, depending on the
fixture) to achieve a Cutoff or Semi-cutoff classification. The FDR is
designed to work with both medium and mogul base sockets. Its'
compact size allows it to be an effective system for many smaller
fixtures that larger reflectors will not fit in. The FDR optical system
provides uniform lighting through a wide range of vertical and
horizontal angles, and will not create hot spots directly beneath or
surrounding the pole.
The SLL is an aluminum reflector that utilizes a vertical lamp with a
refractive lens to achieve a Semicutoff classification (Type lll and
Type V available). It efficiently minimizes light to the upper
hemisphere by reducing wasted light above 90°. The SLL is
designed to work with both medium and mogul based sockets.
This model is limited to use on the fixture series below:
AO28, ARP23, ASR26, D540, D701, D710, D730AO, D730ARP,
D750
While maximum vertical candela is at 70 degrees, which allows wide
pole spacing, there is very little light approaching the 80 to 90
degree glare zone. The optical system is capable of delivering Type
III or V light distribution but actual IES classifications may vary
depending on the fixture in which it is installed.
Cutoff
SLL-FDR
The SLL-FDR optical system provides uniform lighting
and will not create hot spots directly beneath or
surrounding the pole. The SLL-FDR combines the SLL
reflector (shown left) with the FDR (above left) to achieve
an IES cutoff classification in the available fixtures listed
below. It is designed to work with both medium and
mogul based sockets.
This model is limited to use on the fixture series below:
AO28, ARP23, ASR26, D540, D701, D710, D730AO,
D730ARP, D750
HR
The HR system utilizes a specular segmented reflector
for use with a horizontal lamp to achieve Cutoff
classification. There are models designed to work with
both medium and mogul base lamps.
Typical
System
The use of this reflector is limited to fewer fixtures due to
its larger size and lamp position as opposed to the more
compact and versatile FDR. The HR optical system
provides uniform lighting through a wide range of
vertical and horizontal angles.
Optical Accessory
House side shields are available to
cutoff all direct light through certain
horizontal angles (90 degrees or 180
degrees). House side shields also work
together with most optical systems for
additional light control. Please consult
factory for more information.
Maximum vertical candela is between 65 and 70
degrees depending on the reflector. There are HR
models available that can achieve Type II, III, IV, and V
horizontal IES classifications in most fixtures.
Amerlux Exterior Global Lighting Solutions
5220 Shank Road
Pearland, Texas 77581
800.364.0098
Fax: 281.997.5441
90°
Typical Polar Plot
HR
D154-TS20R-UL
D154-TS20
LS2
LS1
80°
HR
70°
13"
HR
16"
20"
20"
30°
Typical Polar Plot
90°
PT137/DS20-AF12
80°
LS2
PT139/DS20-AF12
LS2
25"
24"
70°
20"
30°
20"
Typical configurations (for others see catalog)
19"
19"
36"
37"
25"
36"
36"
36"
15"
4"
PT01
PT51
PT52
WBRO3
WBRO6-15
wall mounted
Slip Fits 3"OD tenon
Typical Polar Plot
HR
D142/FS22
D142/RFS22
LS3
LS3
90°
HR
80°
HR
161/2"
161/2"
70°
30°
22"
25"
22"
59"
31"
53"
PT40
27"
51"
51"
PT41R
PT42R
Slip Fits 4"OD tenon
Available in three and four
arm configurations.
Maximum Wattage for Luminaires
voltage
*120, 277
**120, 208,
**240, 277
consult factory
for 480
Light Source 1
(LS1)
Incandescent
Compact Fluorescent
Pulse Start Metal Halide
High Pressure Sodium
*50
*50
*PL-13
**70
**70
8
**100
*(2)PL-13
**100
**100
48"
WBR41
wall mounted
Light Source 2
(LS2)
**150
CFL 26, 32, or 42
**150
**150
Light Source 3
(LS3)
**200
CFL 26, 32, or 42
**250
**250
Cutoff Fixtures
18"
15"
15"
29"
31"
36"
FDR
HR
FDR
HR
FDR
HR
D241(TA)
D242(CA)
D282(TA)
LS2
LS3
LS2
Clear Acrylic (CA) or Textured Acrylic (TA) lens only
Typical Polar Plot
FDR
90°
Typical Polar Plot
HR
90°
80°
Fixtures slip fit a 3"OD tenon.
80°
70°
70°
30°
30°
19"
Fixtures slip fit a 3"OD tenon.
14"
D623 Typical Polar Plot
FDR
90°
80°
70°
30°
38"
30"
90°
D323 Typical Polar Plot
HR
80°
FDR
HR
FDR
70°
D323(TA)
D623(TA)
LS3
LS1
30°
Clear Acrylic (CA) or Textured Acrylic (TA) lens only
Maximum Wattage for Luminaires
voltage
*120, 277
**120, 208,
**240, 277
consult factory
for 480
Light Source 1
(LS1)
Incandescent
Compact Fluorescent
Metal Halide
High Pressure Sodium
Amerlux Exterior Global Lighting Solutions
*50
*50
5220 Shank Road
*PL-13
**70
**70
Light Source 2
(LS2)
Light Source 3
(LS3)
**100
**150
**200
*(2)PL-13 **CFL 26, 32, or 42 **CFL 26, 32, or 42
**100
**150
**250
**100
**150
**250
Pearland, Texas 77581
800.364.0098
Fax: 281.997.5441
Cutoff Fixtures
16"
17"
31"
34"
FDR
FDR
Typical Polar Plot
FDR
90°
80°
D226(TA)
LS2
70°
D228(TA)
LS2
Clear Acrylic (CA) or Textured Acrylic (TA) lens only
30°
Fixtures slip fit a 3"OD tenon.
16"
21"
Fitter Choices
Replace the blue number to make a fitter choice.
Example: D487-TA
3
2
19"
19"
FDR
HR
10"
8"
FDR
HR
4
1
LS3
12"
LS3
LS3
8
10"
8"
5
D487(TA)
D496(TA)
LS3
LS3
LS2
LS3
9
111/2"
61/2"
Clear Acrylic (CA) or Textured Acrylic (TA) lens only
101/2"
LS3
111/2"
LS3
Fixtures slip fit a 3"OD tenon.
Other eight sided fixtures
Typical Polar Plot
FDR
90°
Typical Polar Plot
90° HR
80°
80°
70°
30°
FDR
HR
See Page 6 for
details
34"
FDR
HR
70°
Optical Systems
21"
21"
30°
Cutoff Classification is
achieved with the use of
clear or clear textured
lenses. The use of white
or prismatic lenses will
not meet Cutoff
Classification.
10
35"
FDR
HR
D343(TA)
D433(TA)
LS3
LS3
Cutoff Fixtures
26"
17"
18"
34"
50"
FDR
HR
FDR
D231
HR
Fixtures slip fit a 3"OD tenon.
D357
LS2
90°
80°
41"
Slip fits a 4"OD tenon
LS3
Typical Polar Plot
HR
90°
80°
LS3
Typical Polar Plot
HR
90°
80°
70°
70°
DC510
Typical Polar Plot
HR
70°
30°
30°
30°
LS2 only
21"
LS1 only
Fitter Choices
Replace the blue number to make a fitter choice.
Example: D136-C/ST
18"
3
4
1
16"
12"
8"
19"
8
7
8"
FDR
FDR
D136-C/ST-VCO
61/2"
9
111/2"
10"
8"
5
101/2"
111/2"
Fixtures slip fit a 3"OD tenon.
D132-C18/ST-VCO
Other globed fixtures
18"
21"
Typical Polar Plot
FDR
90°
31"
26"
80°
FDR
FDR
70°
D151-C/ST-VCO
LS1
30°
D153-C/ST-VCO
LS2
Maximum Wattage for Luminaires
voltage
*120, 277
**120, 208,
**240, 277
consult factory
for 480
Light Source 1
(LS1)
Incandescent
Compact Fluorescent
Pulse Start Metal Halide
High Pressure Sodium
Amerlux Exterior Global Lighting Solutions
*50
*50
5220 Shank Road
*PL-13
**70
**70
Light Source 2
(LS2)
Light Source 3
(LS3)
**100
**150
**200
*(2)PL-13 **CFL 26, 32, or 42 **CFL 26, 32, or 42
**100
**150
**250
**100
**150
**250
Pearland, Texas 77581
800.364.0098
Fax: 281.997.5441
Cutoff Fixtures
18"
15"
27"
25"
23"
FDR
6 1/2"
18"
18"
FDR
D135/AP24
LS2
26"
30"
FDR
12"
FDR
8"
90°
4
2
80°
Fixtures slip fit a 3"OD tenon.
70°
101/2"
10"
LS3
8
7
6
LS3
9
111/2"
10"
8"
LS3
8"
D771AP
LS3
D771
LS3
Fitter Choices
Replace the blue number to make a fitter choice.
Example: D135/AP24
Typical Polar Plot
FDR
FDR
8"
D131SRCG
LS3
Clear textured lens only
D133CG
LS3
21"
LS3
111/2"
LS3
LS3
30°
18"
Fitter Choices
Replace the blue number to make a fitter choice.
Example: D723
4
2
1
LS3
32"
LS3
LS2
7
8
9
111/2"
10"
8"
LS3
Typical Polar Plot
FDR
FDR
HR
61/2"
LS3
6
LS3
5
101/2"
10"
8"
Fixtures slip fit a 3"OD tenon.
111/2"
LS3
90°
LS3
Typical Polar Plot
HR
90°
12"
80°
80°
70°
70°
D723
LS3
Optical Systems
FDR
HR
See Page 6 for
details
30°
Cutoff Classification is
achieved with the use of
clear or clear textured
lenses. The use of white
or prismatic lenses will
not meet Cutoff
Classification.
12
30°
Cutoff Fixtures
16"
16"
18"
18"
26"
29"
30"
32"
SLL-FDR
8"
*SLL
D136/AO28-T5
Typical Polar Plot
FDR
90°
111/2"
SLL-FDR
SLL-FDR
*SLL
D138/ARP23-T5
61/2"
*SLL
D735ARP23-T5
D735AO-T5
Fitter Choices
Replace the blue number to make a fitter choice.
Example: D136/AO28
2
80°
SLL-FDR
61/2"
*SLL
*SLL alone will provide a *
semicutoff classification.
3
4
70°
12"
8"
LS3
12"
LS3
9
7
1
101/2"
LS3
LS3
111/2"
10"
LS3
LS3
30°
15"
14"
Fixtures slip fit a 3"OD tenon.
25"
These fixtures feature a
borosilicate glass
refractor with Type lll or
Type V distribution.
19"
FDR
FDR
61/2"
8"
D135/AR18GLJ-T5
90°
Typical Polar Plot
FDR
2
80°
D761-T5
Fitter Choices
Replace the blue number to make a fitter choice.
Example: D135/AR18GLJ
3
4
70°
12"
LS3
12"
LS3
101/2"
LS3
LS3
9
111/2"
10"
8"
LS3
8
7
6
LS3
111/2"
LS3
30°
Amerlux Exterior Global Lighting Solutions
5220 Shank Road
Pearland, Texas 77581
800.364.0098
Fax: 281.997.5441
www.amerluxexterior.com
Cutoff Fixtures
Fixtures slip fit a 3"OD tenon.
19"
19"
18"
18"
26"
26"
31"
31"
10"
SLL-FDR
*SLL
SLL-FDR
SLL-FDR
*SLL
*SLL
10"
SLL-FDR
8"
*SLL
D547-T5
D701-T5
D731-T5
D757-T5
LS3
LS3
LS3
LS3
Typical Polar Plot
FDR
90°
Fitter Choices
Replace the blue number to make a fitter choice.
Example: D547
2
3
8
4
80°
12"
70°
12"
LS3
*SLL alone will provide a *
semicutoff classification.
5
101/2"
LS3
111/2"
8"
61/2"
LS3
9
6
LS2
LS3
111/2"
LS3
LS3
30°
All IES
Classifications
shown are achieved
with clear textured or
clear refractive
lenses. The use of
white lenses will not
meet these
classifications.
Semicutoff Fixtures
Fixtures slip fit a 3"OD tenon.
23"
20"
20"
FDR
101/2"
FDR
10"
FDR
D132/AO21
D134/AO25
D136/AR20
LS3
LS3
LS3
Optical Systems
Clear textured lens only
Fitter Choices
Replace the blue number to make a fitter choice.
Example: D132/AO21
90°
3
12"
8"
LS3
8
7
1
See Page 6 for
details
8"
5
LS3
LS2
111/2"
10"
61/2"
LS3
9
LS3
Typical Polar Plot
FDR
80°
111/2" 70°
LS3
30°
Maximum Wattage for Luminaires
voltage
*120, 277
**120, 208,
**240, 277
consult factory
for 480
Light Source 1
(LS1)
Incandescent
Compact Fluorescent
Metal Halide
High Pressure Sodium
*50
*50
*PL-13
**70
**70
14
Light Source 2
(LS2)
Light Source 3
(LS3)
**100
**150
**200
*(2)PL-13 **CFL 26, 32, or 42 **CFL 26, 32, or 42
**100
**150
**250
**100
**150
**250
Ordering Guide
Lens
Voltage
Optical System
D242(CA) / 100HPS - 120v / BLK / FDR
Luminaire
Light Source
Powdercoat Finishes
Classic Bronze (CLB)
Green (GRN)
Satin Black (BLK)
Textured Black (TBK)
www.amerluxexterior.com
5220 Shank Road
Pearland, Texas 77581
800.364.0098
Fax: 281.997.5441
Finish
HR3
HR5
SLL
SLL-FDR
Not all existing options
shown in the catalog are
compatible when the FDR is
specified.
When ordering, consult your
catalog and add "FDR" to
the end of the part string.
Premium Finishes (adder will apply)
Antique Copper (ATC)
Granite Green (GTG)