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COOPER LIGHTING - METALUX
6"
DESCRIPTION
The GR8 is a T8-dedicated lensed troffer designed to offer premium
performance in a low profile housing. T8 dedication and optimized
lamp to lens spacing provides the best in energy efficiency and optical
control. The GR8’s shallow, low profile housing is compatible with even
highly restrictive plenums. Luminaires are compatible with today’s
popular ceiling systems.
Catalog #
Project
Comments
®
Type
Date
The GR8 offers great performance and great quality. The series is an
excellent choice for commercial offices, schools, hospitals, retail
merchandising and many other applications.
SPECIFICATION FEATURES
Construction
Unitized low profile recessed
housing is die formed of code
gauge prime cold rolled steel
with full length stiffeners and
unibody endplate for added
strength. Ballast cover is easily
removed without tools. Die
formed captive lampholder
bracket fully encloses
lampholder wiring for easy
lampholder replacement.
Ample KOs are provided for
continuous row wiring. Built-in
grid-lock feature for safety and
convenience.
Electrical**
Ballasts are CBM/ETL Class
“P” and are positively secured
by mounting bolts. Rotor-lock
lampholders. UL/CUL listed.
Suitable for damp locations.
Finish
Multistage, iron phosphate
pretreatment ensures maximum
bonding and rust inhibition.
Lighting grade baked white
enamel finish with premium
reflectance for high efficiency.
Hinging/Latching
Positive spring loaded steel
latches and safety lock T-hinges
provide secure, high quality door
fit and allow hinging and latching
from either side.
Prepared by
Frame/Shielding
Heavy gauge flat steel door is die
formed with reinforced mitered
corners. Housing and door frame
assemblies incorporate full width
mechanical light traps. Light
stabilized, acrylic prismatic lens.
Controls
Fifth Light ballast options
are offered for both 0-10V
continuous dimming and DALI
applications. Combine with
energy-saving products like
occupancy sensors, daylighting
controls, and lighting relay
panels from Cooper Controls
(www.coopercontrol.com) to
maximize energy savings.
2GR8
328T8
332
2’ X 4’ TROFFER
3 T8 LAMPS
General Purpose
T8 Commercial Troffer
MOUNTING DATA
Location of Standard
Access Opening
23-3/4"
[603mm]
1-1/2"
[38mm]
3-1/2"
[89mm]
DOOR FRAMES
2GR8
Flat, White
Steel (White
Latches)
CEILING COMPATIBILITY
G
Grid/Lay-in
Standard
47-15/16" [1218mm]
G
Concealed T
1-1/2"
[38mm]
1"
[26mm]
G
Slot Grid
23-3/4" [603mm]
2-11/1
[69mm]
3-1/8"
[80mm]
F
Flange Trim
With Supporting
Swing Gates
LAMP CONFIGURATIONS
3-1/4" [83mm]
X=5-3/8"
[137mm]
X X
23-3/4" [603mm]
3-1/4"
[83mm]
Ceiling Trim
Type Type
Exposed Grid G
Concealed T G
Slot Grid G
Flange G***
ENERGY DATA
Input Watts:
EB Ballast & STD Lamps
328T8 (67)
332 (91)
Luminaire Efficacy Rating
LER = FL-75
Catalog Number: 2GR8-332A
Yearly Cost of 1000 lumens,
3000 hrs at .08 KWH = $3.20
*Standard G (Grid) Type Fixtures can be
field converted by adding trim kits. See
Compatibility Section or Consult Factory.
**Reference the lamp/ballast data in the
Technical Section for specific lamp/ballast
requirements.
***When ordering Flange Kit for
installation in drywall ceilings, see options
and accessories compatibility section and
ordering logic.
LAMPS CONTAIN MERCURY. DISPOSE ACCORDING TO
LOCAL, STATE OR FEDERAL LAWS
Safe and convenient means of
disconnecting power.
COOPER LIGHTING
ADF012708
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PHOTOMETRICS
2GR8
2GR8-332A
Candela
Electronic Ballast
(3) F28T8 lamps
3100 lumens
Spacing criterion:
(II) 1.2 x mounting
height, (⊥) 1.4 x
mounting height
Efficiency 77.6%
Test Report:
2GR8-332A.IES
LER = FL-75
Yearly Cost of 1000
lumens, 3000 hrs at
.08 KWH = $3.20
Coefficients of Utilization
Effective floor cavity reflectance 20%
rc 80% 70% 50% 30% 10% 0%
rw 70 50 30 10 70 50 30 10 50 30 10 50 30 10 50 30 10 0
RCR
92 92 92 92 90 90 90 90 86 86 86 82 82 82 79 79 79 78
0
85 81 78 75 83 80 77 74 76 74 72 73 71 70 70 69 67 66
1
78 72 67 62 76 70 65 62 67 63 60 65 62 59 62 60 57 56
2
71 63 57 52 69 62 56 52 60 55 51 58 54 50 56 52 49 48
3
65 56 50 45 64 55 49 45 53 48 44 52 47 43 50 46 43 41
4
60 51 44 39 59 50 43 39 48 43 38 47 42 38 45 41 37 36
5
56 46 39 34 54 45 39 34 44 38 34 42 37 33 41 37 33 32
6
52 41 35 30 50 41 35 30 40 34 30 39 33 30 38 33 29 28
7
48 38 31 27 47 37 31 27 36 31 27 35 30 27 34 30 26 25
8
45 35 29 24 44 34 28 24 33 28 24 33 28 24 32 27 24 23
9
42 32 26 22 41 32 26 22 31 26 22 30 25 22 30 25 22 20
10
Angle Along II 45° Across ⊥
0
2717 2717 2717
5
2719 2706 2716
10
2684 2685 2708
15
2622 2648 2691
20
2537 2592 2655
25
2419 2510 2594
30
2276 2400 2503
35
2101 2256 2383
40
1888 2059 2225
45
1630 1808 1991
50
1342 1537 1688
55
1082 1248 1345
60
847 928 1011
65
640 632 731
70
471 405 527
75
333 271 394
80
237 206 295
85
127 127 169
90
12 25 36
Zonal Lumen Summary
Zone Lumens %Lamp %Fixture
2162 23.2 30.0
0-30
3564 38.3 49.4
0-40
6046 65.0 83.8
0-60
7213 77.6 100.0
0-90
7213 77.6 100.0
0-180
Luminance Data
Angle 0-Deg 45-Deg 90-Deg
in Deg cd/sm cd/sm cd/sm
45 3697 4101 4516
55 3026 3490 3761
65 2429 2399 2774
75 2064 1679 2442
85 2337 2337 3110
Average Average Average
Customer First Center 1121 Highway 74 South Peachtree City, GA 30269 770.486.4800 FAX
Visit our web site at www.cooperlighting.com
770.486.4801 8/14/18
ADF012708
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ORDERING INFORMATION
SAMPLE NUMBER: 2GR8-332A-UNV-EB81-U
2GR8
(5)
Rating
Blank=
Standard
ATW-SW4=
Chicago
Rated
Width
2=2' Width
Trim Type
G=Grid/Lay-in
(Standard)
Series
R8=General Purpose
T8 Commercial
(1)
Troffer
(1)
NOTES:
An EQ Grid Clip is recommended for all 9/16” ceiling systems. Four required per
(2)
fixture.
Products also available in non-US voltages and frequencies for international markets.
(3)
Not available when specifying emergencies, voltage must be specific.
ballast compartment on 3-lamp fixtures.
(6)
sheets.
For a complete listing of Fifthlight Technology products and other solutions from Cooper
Controls, visit www.coopercontrol.com.
ballasts.
Specifications & dimensions subject to change without notice. Consult your Cooper Lighting
Representative for availability and ordering information.
Number of
(4)
Lamps
3=3 Lamps
(Not included)
Wattage
28T8=28W T8 (48")
32=32W T8 (48")
Shielding
A=#12 Acrylic Pattern
A125=#12 Pattern Acrylic
(.125" Thick)
A19/156=#19 Pattern
Acrylic (.156" Thick)
PB1S=Silver Parabolic
Louver (1/2" x 1/2" x 1/2")
(5)
For NYC rated product, see separate specification
(7)
For 5LT8 Fifth Light DALI, 3-lamp models require (2)
(2)
Voltage
120V=120 Volt
277V=277 Volt
347V=347 Volt
UNV=Universal
Voltage 120-277
Options
GL=Single Element Fuse
GM=Double Element Fuse
Flex=Flex Installed
EL=Emergency Installed
(3)
(4)
Standard off-center
Ballast Type
=T8 Electronic Start. Total Harmonic
EB8
Distortion < 10%
EB8 /PLUS= T8 Electronic Start. Total
ER8 = T8 Electronic Program Rapid Start.
High Performance T8 Ballasts
HB8
HB8 L=T8 Electronic Instant Start.
HB8 N=T8 Electronic Instant Start.
HB8 H=T8 Electronic Instant Start.
HR8 T8 Electronic Program Rapid Start.
HR8 DIM=T8 Electronic Program Rapid Start.
HR8 L=T8 Electronic Program Rapid Start.
HR8 H=T8 Electronic Program Rapid Start.
Fifth Light DALI Ballasts
5LT8 = T8 DALI Program Rapid Start.
Total Harmonic Distortion < 10%.
Harmonic Distortion < 10%. High
Ballast Factor > 1.15.
Total Harmonic Distortion < 10%
=T8 Electronic Instant Start.
Total Harmonic Distortion < 10%.
Standard Ballast Factor .86 – .88
Total Harmonic Distortion < 10%. Low
Ballast Factor .77 – .82
Total Harmonic Distortion < 10%.
Normal Ballast Factor 1.0
Total Harmonic Distortion < 10%.
High Ballast Factor 1.15 – 1.20
Total Harmonic Distortion < 10%.
Standard Ballast Factor .86 – .88
Total Harmonic Distortion < 10%.
Step Dimming. Ballast Factor .88
Total Harmonic Distortion < 10%.
Low Ballast Factor .71 – .79
Total Harmonic Distortion < 10%.
High Ballast Factor 1.15 – 1.20
Ballast Factor 1.0
(6)
(7)
Options
FR=Fire Label
Packaging
U=Unit Pack
PAL=Job
Pack, out of
carton
PALC=Job
Pack, in
carton
ACCESSORIES
EQ-CLIP-U=T-BAR Safety Earthquake Clips
FCTKA-24W-U=Field Installed Flange Kit
FCTK A –
Trim Kit
Field
Convertible
Aluminum
24
22=2' x 2'
24=2' x 4'
Blank=Single
R=In Row
E=End Row
R W
N=Natural
W=White
U=Unit Pack
(1)
– U
Number of Ballasts
1=1 Ballast
2=2 Ballasts
3=3 Ballasts
SHIPPING INFORMATION
Catalog No. Wt.
2GR8-328T8A 20 lbs.
2GR8-332A 20 lbs.
Visit our web site at www.cooperlighting.com
Customer First Center 1121 Highway 74 South Peachtree City, GA 30269 770.486.4800 FAX 770.486.4801 8/14/18
ADF012708
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