Cut Sheet
TWH_M_S_L
OUTDOOR: One Lithonia Way Conyers, GA 30012 Phone: 770.922.9000 www.lithonia.com ©1989-2018 Acuity Brands Lighting, Inc. All rights reserved. Rev. 02/26/18
TWH Metal Halide Wall-Packs
Coefficient of Utilization
Initial Footcandles
Mounting Height Correction Factor
(Multiply the fc level by the correction factor)
15 ft. = .64
20 ft. = .36
25 ft. = .23
TWH 250M Test report no. 95011902P
TWH 400M Test report no. 94112102P
Notes
1 Photometric data for other distributions can be accessed from the Lithonia Lighting Web site. (www.lithonia.com)
Existing Mounting Height
New Mounting Height
2
= Correction Factor
TWH 250S Test report no. 94121002
Distance in units of mounting height
Coefficients of utilization
TWH 400S Test report no. 94121001
Distance in units of mounting height
Coefficients of utilization
Distance in units of mounting height Distance in units of mounting height
250W, high pressure sodium lamp, horizontal lamp orienta-
tion, 12' mounting height, 27,500 rated lumens.
Total fixture efficiency: 70.9%
400W, high pressure sodium lamp, horizontal lamp orienta-
tion, 12' mounting height, 50,000 rated lumens.
Total fixture efficiency: 70.9%
2
1
0
1
2
3
4
5
10
1
2
2
.1
0 1 2 3 4 5 6
5
5
2
1
0
1
2
3
4
5
10
1
2
2
.1
0 1 2 3 4 5 6
5
5
TWH 35L Test report no. 94121902
2
1
0
1
2
3
4
5
1
2
2
.1
0 1 2 3 4 5 6
5
Distance in units of mounting height
Distance in units of mounting height
35W, low pressure sodium lamp, horizontal lamp orientation, 12'
mounting height, 4,800 rated lumens.
Total fixture efficiency: 54.6%
DISTANCE IN UNITS OF MOUNTING HEIGHT
ISOILLUMINANCE PLOT (Footcandle)
250W pulse start metal halide lamp, horizontal lamp orientation
Footcandle values based on 12'
mounting height, 25000 rated lumens.
-2
-1
0
1
2
3
4
5
0123456
5
2.5
1.5
1
0.5
0.25
Luminaire Efficiency: 77%
DISTANCE IN UNITS OF MOUNTING HEIGHT
ISOILLUMINANCE PLOT (Footcandle)
400W pulse start metal halide lamp, horizontal lamp orientation
Footcandle values based on 12'
mounting height, 38000 rated lumens.
-2
-1
0
1
2
3
4
5
0123456
5
2.5
1.5
1
0.5
0.25
Luminaire Efficiency: 70%