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CFL Lensed Downlight
8096
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7" Aperture (2) Quad Tube Horizontal Lamp
Job Information
Type:
Quick Calculator
% Effective Ceiling Cavity Reflectance
80
70
50
30
10
0
%Wall Reflectance
50 30 10
50 30 10
50 30 10
50 30 10
50 30 10
0
1 .41 .40 .39 .41 .40 .39 .39 .38 .38 .38 .37 .36 .36 .36 .35 .35
2 .38 .37 .35 .38 .36 .35 .38 .35 .34 .35 .34 .34 .34 .34 .33 .32
3 .35 .33 .32 .35 .33 .32 .34 .32 .31 .33 .32 .31 .32 .31 .30 .30
4 .33 .31 .29 .32 .31 .29 .32 .30 .29 .31 .29 .28 .30 .29 .28 .27
5 .30 .28 .26 .30 .28 .26 .29 .27 .26 .29 .27 .25 .28 .27 .25 .25
6 .28 .26 .24 .28 .26 .24 .27 .25 .24 .27 .25 .24 .26 .25 .23 .23
7 .26 .23 .22 .26 .23 .22 .25 .23 .22 .25 .23 .21 .24 .23 .21 .21
8 .24 .21 .20 .24 .21 .20 .23 .21 .20 .23 .21 .19 .22 .21 .19 .19
9 .22 .20 .18 .22 .20 .18 .21 .19 .18 .21 .19 .18 .21 .19 .18 .17
10 .20 .18 .16 .20 .18 .16 .20 .18 .16 .20 .18 .16 .19 .17 .16 .16
26W Fresnel Lens
Spacing Ratio = 1.2
Coefficients of Utilization
ROOM
CA
VITY
RA
TIO
20% FLOOR CAVITY REFLECTANCE
INITIAL
FOOTCANDLES
60
50
40
30
20
10
20
40
60
80
100
120
140
ROOM SURFACE REFLECTANCES:
80% Ceiling; 50% Wall, 20% Floor
1800 Lumens Per Lamp
RCR= 1
(Rm. Width = 10xMtg. Ht. above work plane)
RCR= 5
(Rm. Width = 2xMtg. Ht. above work plane)
RCR=10
(Rm. Width = Mtg. Ht. above work plane)
AREA PER FIXTURE IN SQUARE FEET
This quick calculator chart determines the number and spacing of 2 Lt. 26 watt Quad
Tube units with Fresnel Lens and clear cone, for any level of illumination.
Conversion Factors: 26W, Fresnel Lens with White Cone = F.C.x 0.9; 18W, Fresnel/Clear
Cone = 0.8; 18W Fresnel/Clear Cone =0.7.
4
5
6
7
8
9
10
11
12
CENTER TO CENTER DISTANCE OF FIXTURES IN FEET
Certified Test Report Number: 2550
COMPUTED BY: LSI PROGRAM “TEST-LITE”
PREPARED FOR: LIGHTOLIER INC.
APERTURE: 7 1/4”
REFLECTOR: SPECULAR CLEAR ALZAK CONE WITH REGRESSED FRESNEL LENS
LAMPS: TWO 26W QUAD TUBE LENS EACH RATED AT 1800 LUMINES.
CANDELPOWER SUMMARY
Angle ALONG 22.5
45
67.5 ACROSS LUMENS
0
864
864
864
864
864
5
852
850
851
868
875
82
10
836
842
860
887
897
15
806
818
849
881
888
238
20
750
774
812
835
842
25
670
703
743
769
771
336
30
572
602
643
670
677
35
453
495
533
556
556
328
40
350
388
416
433
438
45
255
284
312
321
322
241
50
207
222
240
249
249
55
70
82
93
103
105
102
60
29
31
38
42
41
65
8
9
12
10
10
15
70
3
3
6
3
3
75
2
2
3
2
2
3
80
1
1
4
2
1
85
1
2
5
3
2
4
90
2
9
14
6
2
ZONAL LUMENS AND PERCENTAGES
Zone
Lumens
% Lamp
% Luminaire
0–30
657
18.25
48.66
0–40
985
27.37
72.97
0–60
1328
36.90
98.37
0–90
1350
37.50
100.00
40–90
364
10.14
27.03
60–90
21
.61
1.63
90–180
0
.00
.00
0–180
1350
37.50
100.00
**EFFICIENCY = 37.5%**
TESTED ACCORDING TO IES PROCEDURES. TEST DISTANCE EXCEEDS FIVE TIMES
THE GREATEST LUMINOUS OPENING OF LUMINAIRE.
DATE: NOVEMBER 18, 1992
Quick Calculator
% Effective Ceiling Cavity Reflectance
80
70
50
30
10
0
%Wall Reflectance
50 30 10
50 30 10
50 30 10
50 30 10
50 30 10
0
1 .34 .33 .33 .34 .33 .32 .32 .32 .31 .31 .31 .30 .30 .30 .29 .29
2 .32 .30 .29 .31 .30 .29 .30 .29 .28 .29 .28 .28 .28 .28 .27 .26
3 .29 .27 .26 .29 .27 .26 .28 .27 .25 .27 .26 .25 .26 .25 .25 .24
4 .27 .25 .23 .27 .25 .23 .26 .24 .23 .25 .24 .23 .25 .23 .22 .22
5 .25 .23 .21 .24 .22 .21 .24 .22 .21 .23 .22 .21 .23 .21 .20 .20
6 .23 .21 .19 .22 .20 .19 .22 .20 .19 .21 .20 .19 .21 .20 .18 .18
7 .21 .19 .17 .20 .18 .17 .20 .18 .17 .20 .18 .17 .19 .18 .17 .16
8 .19 .17 .15 .19 .17 .15 .18 .16 .15 .18 .16 .15 .18 .16 .15 .14
9 .17 .15 .14 .17 .15 .14 .17 .15 .14 .17 .15 .13 .16 .15 .13 .13
10 .16 .14 .12 .16 .14 .12 .15 .14 .12 .15 .13 .12 .15 .13 .12 .12
26W Opal Diffuser and Clear Lens
Spacing Ratio = 1.2
Coefficients of Utilization
ROOM
CA
VITY
RA
TIO
20% FLOOR CAVITY REFLECTANCE
INITIAL
FOOTCANDLES
60
50
40
30
20
10
15
30
45
60
75
90
105
120
ROOM SURFACE REFLECTANCES:
80% Ceiling; 50% Wall, 20% Floor
1800 Lumens Per Lamp
RCR= 1
(Rm. Width = 10xMtg. Ht. above work plane)
RCR= 5
(Rm. Width = 2xMtg. Ht. above work plane)
RCR=10
(Rm. Width = Mtg. Ht. above work plane)
AREA PER FIXTURE IN SQUARE FEET
This quick calculator chart determines the number and spacing of 2 lt.-26 watt Quad
Tube units with Opal Diffuser and Clear Cone for any level of illumination.
Conversion Factors: Opal Diffuser/White Cone = F.C. x 0.9. Clear Lens/Clear Cone = F.C. x 1.2.
Clear Lens/White Cone = F.C. x 1.1; 18W, Opal Diffuser/Clear Lens = 0.8; Opal Diffuser/White
Cone = 0.7; Clear Lens/Clear Cone = 0.9; Clear Lens/White Cone = 0.8.
4
5
6
7
8
9
10
11
CENTER TO CENTER DISTANCE OF FIXTURES IN FEET
Certified Test Report Number: 2551
COMPUTED BY: LSI PROGRAM “TEST-LITE”
PREPARED FOR: LIGHTOLIER INC.
APERTURE: 7 1/4”
REFLECTOR: SPECULAR CLEAR WITH REGRESSED OPAL DIFFUSER
LAMPS: TWO 26W QUAD TUBE EACH RATED AT 1800 LUMINES.
CANDELPOWER SUMMARY
Angle Along
22.5
45
67.5 Across Lumens
0
634
634
634
634
634
5
622
622
634
643
622
60
10
613
613
625
635
615
15
594
595
608
620
601
171
20
565
567
582
594
576
25
529
532
549
562
543
251
30
482
486
503
519
504
35
430
433
449
464
454
279
40
370
374
386
401
392
45
299
302
313
326
319
241
50
227
227
234
244
238
55
87
91
96
104
102
104
60
30
32
37
41
40
65
7
8
11
10
9
14
70
2
3
6
3
3
75
2
2
3
2
1
2
80
1
1
4
2
1
85
1
1
4
3
1
4
90
1
9
14
7
2
ZONAL LUMENS AND PERCENTAGES
Zone
Lumens
% Lamp
% Luminaire
0–30
481
13.38
42.75
0–40
761
21.15
67.55
0–60
1106
30.73
98.15
0–90
1126
31.30
100.00
40–90
365
10.16
32.45
60–90
20
.58
1.85
90–180
0
.00
.00
0–180
1126
31.30
100.00
**EFFICIENCY = 31.1%**
TESTED ACCORDING TO IES PROCEDURES. TEST DISTANCE EXCEEDS FIVE TIMES
THE GREATEST LUMINOUS OPENING OF LUMINAIRE.
DATE: NOVEMBER 19, 1992
Conversion Factors: 26W, Fresnel Lens with White Cone: C.U. x 0.9; 18W, Fresnel/Clear Cone = 1.1;
18W, Fresnel/White Cone = 1.0.
Conversion Factors: 26W, Opal Diffuser/White Cone: C.U. x 0.9. Clear Lens/Clear Cone: C.U. x 1.2. Clear
Lens/White Cone: C.U. x 1.1; Opal Diffuser/Clear Lens = 1.1; Opal Diffuser/White Cone = 1.0; Clear
Lens/Clear Cone = 1.3; Clear Lens/White Cone = 1.2.
ACROSS
45
ALONG
0
30
60
90
300
600
900
ACROSS
45
ALONG
0
30
60
90
200
400
600
