Silhouette SD
Indirect/Direct pendant, 2 lamp, T5/HO
Page 3 of 3
Philips Lightolier
t: (508) 679-8131, Technical info. (978) 657-7600
w: www.lightolier.com
SD September 7, 2012
Specifications are subject to change without notice.
© Koninklijke Philips Electronics N.V., 2012.All rights reserved.
Zonal lumen summary
Zone Lumens % Lamp % Fixt.
0- 90 979 16.9 20.5
90-180 3790 65.3 79.5
0-180 4769 82.2 100.0
Photometry
Efficiency: 82.2%
Lumens: 2900 lm
Lamps: (2) F28T5
Catalog number: SD241281WH
Report number: LRL 299-1F
Vertical Horizontal Angle
Angle 022.5 45 67. 5 90
0286 286 286 286 286
5286 286 289 287 287
15 281 284 286 286 282
25 269 270 272 272 272
35 243 246 247 238 239
45 204 210 201 198 198
55 173 172 166 119 172
65 113 112 125 139 143
75 71 83 102 117 120
85 21 46 64 76 80
95 10 29 47 58 61
105 47 71 71 73 75
115 219 314 284 270 256
125 389 513 555 549 536
135 582 688 781 823 780
145 732 810 885 967 974
155 890 942 1059 1097 1112
165 1006 1029 1097 1128 1142
175 1051 1081 1104 1117 1111
180 1088 1089 1094 1096 1097
Ceiling: 80 70 50
Wall: 70 50 30 70 50 30 50 30 10
RCR 0 82 82 82 73 73 73 55 55 55
175 71 68 66 63 60 48 46 44
268 62 57 60 55 51 42 39 37
362 54 49 54 48 43 37 33 31
457 48 42 50 43 37 32 29 26
552 43 36 45 38 32 29 25 22
647 38 32 42 34 28 26 22 19
744 34 28 38 30 25 23 19 17
840 31 25 36 27 22 21 17 15
937 28 22 33 25 20 19 15 13
10 35 25 19 31 22 17 17 14 11
Based on a floor reflectance of 0.2
Candela distribution Coefficients of utilization (%)Candela curve
8” (20.32cm)
4”
(10.16cm)
4” (10.16cm)
3.4”
(8.64cm)
4.6” (11.68cm)
4” (10.16cm)
8”
(20.32cm)
4”
(10.16cm)
2,000
700
500
400
200
FOOTCANDLE 20 30 50 70 100
12345710 20 30 40 50 70 100200
ROOM AREA IN SQUARE FEET
NUMBER OF FIXTURES REQUIRED
300
1,000
100
90˚
85˚
95˚
105˚
75˚
65˚
55˚
115˚
125˚
180˚ 175˚ 165˚ 155˚ 145˚ 135˚
0˚ 5˚ 15˚ 25˚ 35˚ 45˚
500
250
750
500
1000
250
1250
1250
1000
750
0
90˚
0˚
90˚
85˚
95˚
105˚
75˚
65˚
55˚
115˚
125˚
180˚ 175˚ 165˚ 155˚ 145˚ 135˚
0˚ 5˚ 15˚ 25˚ 35˚ 45˚
500
250
750
500
1000
250
1250
1250
1000
750
0
90˚
0˚
Calculations are for 28 watt T5 lamps, for 54 watt T5 lamps
multiply by 1.7
Quick calculator and ceiling brightness
8” (20.32cm)
4”
(10.16cm)
4” (10.16cm)
3.4”
(8.64cm)
4.6” (11.68cm)
4” (10.16cm)
8”
(20.32cm)
4”
(10.16cm)
2,000
700
500
400
200
FOOTCANDLE 20 30 50 70 100
12345710 20 30 40 50 70 100200
NUMBER OF FIXTURES REQUIRED
300
1,000
100
90˚
85˚
95˚
105˚
75˚
65˚
55˚
115˚
125˚
180˚ 175˚ 165˚ 155˚ 145˚ 135˚
0˚ 5˚ 15˚ 25˚ 35˚ 45˚
500
250
750
500
1000
250
1250
1250
1000
750
0
90˚
0˚
90˚
85˚
95˚
105˚
75˚
65˚
55˚
115˚
125˚
180˚ 175˚ 165˚ 155˚ 145˚ 135˚
0˚ 5˚ 15˚ 25˚ 35˚ 45˚
500
250
750
500
1000
250
1250
1250
1000
750
0
90˚
0˚
1. Find room area on vertical axis.
2. Move across chart to footcandle
curve.
3. Move down to horizontal axis and
read number of fixtures required.
Reflectance of 80% ceiling, 50% walls and 20% floor. Light loss factor is .85, Room size is 50' x 50',
Run Spacing 10’. Ceiling Height 9’ to 12’. Values are taken from the center of the room.
Suspension Length 12" 18" 24"
Footlamberts Above Fixture 209 143 110
Footlamberts Between Fixtures 20.7 21.1 23.9
Ceiling Brightness Ratio 10.1 6.8 4.6
