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
0
22.5
45
67.5
90
0
286
286
286
286
286
5
286
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
1 75 71 68 66 63 60 48 46 44
2 68 62 57 60 55 51 42 39 37
3 62 54 49 54 48 43 37 33 31
4 57 48 42 50 43 37 32 29 26
5 52 43 36 45 38 32 29 25 22
6 47 38 32 42 34 28 26 22 19
7 44 34 28 38 30 25 23 19 17
8 40 31 25 36 27 22 21 17 15
9 37 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
1
2
3
4 5
7
10
20
30 40 50 70 100
200
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
1
2
3
4 5
7
10
20
30 40 50 70 100
200
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˚
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
