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CENTER TO CENTER DISTANCE OF FIXTURES IN FEET
80% Ceiling; 50% Wall; 20% Floor
RCR = 10
RCR = 5
RCR = 1
3200 Lumens Per Lamp
ROOM SURFACE REFLECTANCES:
AREA PER FIXTURE IN SQUARE FEET
8
This quick Calculator chart determines the number and spacing of 1 lt.-42W PL-T units with Comfort
Clear™ reflector for any level of illumination.
3
40
4
5
20
6
7
60
INITIAL FOOTCANDLES
30
10
20
40
50
80
70
60
9
80
10
100
11
120
(Rm. width = Mtg. Ht. above work plane)
(Rm. width = 2 x Mtg. Ht. above work plane)
(Rm. width = 10 x Mtg. Ht. above work plane)
CANDLEPOWER SUMMARY
ANGLE AVERAGE CP LUMENS
180 0
175 0 0
165 0 0
155 0 0
145 0 0
135 0 0
125 0 0
115 0 0
105 0 0
95 0 0
85 2 2
75 4 4
65 5 5
55 16 14
45 334 258
35 797 501
25 1178 545
15 1504 426
5 1585 151
0 1518
ZONAL LUMENS AND PERCENTAGES
ZONE LUMENS % LAMP %LUMINAIRE
0-30 1123 35.1 58.9
0-40 1623 50.7 85.1
0-60 1896 59.3 99.4
0-90 1908 59.6 100.0
40-90 284 8.9 14.9
60-90 12 0.4 0.6
90-120 0 0.0 0.0
90-150 0 0.0 0.0
90-180 0 0.0 0.0
0-180 1908 59.6 100.00
REPORT PREPARED FOR: LIGHTOLIER
REPORT NO:LRL 499-9E
REPORT BY: LIGHTING RESEARCH LABORATORY, INC.
DESCRIP: 7.5” DIA. x 11 HT RECESSED DOWNLIGHT WITH COMFORT CLEAR™
REFLECTOR. LAMPS: 1PLT 42W LUMENS=3200
**Efficiency=59.6%**
May 14, 1999
Coefficients of Utilization
65°
0°
15°
5°
25°
35°
45°
55°
75°
85°
600
1600
1400
1000
1200
800
400
200
Clear™ reflector for any level of illumination. reflector, F.C. x 0.8.
Clear™ reflector for any level of illumination. Conversion factor: 1 lt. 26W PL-T with Comfort Clear
This quick Calculator chart determines the number and spacing of 1 lt.-32W PL-T units with Comfort
80% Ceiling; 50% Wall; 20% Floor
RCR = 10
RCR = 5
RCR = 1
2400 Lumens Per Lamp
ROOM SURFACE REFLECTANCES:
CENTER TO CENTER DISTANCE OF FIXTURES IN FEET
AREA PER FIXTURE IN SQUARE FEET
8
3
40
4 5
20
6 7
60
INITIAL FOOTCANDLES
30
10
20
40
50
80
70
60
9
80
10
100
11
120
(Rm. width = Mtg. Ht. above work plane)
(Rm. width = 2 x Mtg. Ht. above work plane)
(Rm. width = 10 x Mtg. Ht. above work plane)
Coefficients Of Utilization
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 .69 .67 .66 .67 .66 .65 .65 .64 .63 .63 .62 .61 .61 .60 .59 .58
2 .65 .63 .61 .64 .62 .60 .62 .60 .50 .60 .59 .58 .58 .57 .56 .56
3 .61 .59 .57 .61 .58 .56 .59 .57 .55 .58 .56 .55 .56 .55 .54 .53
4 .58 .55 .53 .57 .54 .52 .56 .54 .52 .55 .53 .51 .54 .52 .50 .50
5 .55 .51 .49 .54 .51 .49 .53 .50 .49 .52 .50 .48 .51 .49 .48 .47
6 .52 .48 .40 .51 .48 .40 .50 .48 .40 .50 .47 .45 .49 .47 .45 .44
7 .49 .45 .43 .46 .45 .43 .48 .45 .43 .47 .44 .43 .46 .44 .42 .42
8 .46 .42 .40 .40 .42 .40 .45 .42 .40 .44 .42 .40 .44 .41 .40 .39
9 .43 .40 .37 .43 .39 .37 .42 .39 .37 .42 .39 .37 .41 .39 .37 .36
10 .38 .35 .32 .38 .35 .32 .38 .35 .32 .37 .34 .32 .37 .34 .32 .31
20% FLOOR CAVITY REFLECTANCE
ROOM CAVITY RATIO
TESTED ACCORDING TO IES PROCEDURES. TEST DISTANCE EXCEEDS FIVE TIMES THE
GREATEST LUMINOUS OPENING OF LUMINAIRE.
CANDLEPOWER SUMMARY
ANGLE AVERAGE CP LUMENS
180 0
175 0 0
165 0 0
155 0 0
145 0 0
135 0 0
125 0 0
115 0 0
105 0 0
95 0 0
85 1 1
75 2 2
65 3 3
55 11 10
45 226 175
35 678 426
25 933 432
15 1117 317
5 1179 113
0 1126
ZONAL LUMENS AND PERCENTAGES
ZONE LUMENS % LAMP %LUMINAIRE
0-30 861 35.9 58.3
0-40 1287 53.6 87.1
0-60 1472 61.3 99.6
0-90 1478 61.6 100.0
40-90 191 8.0 12.9
60-90 6 0.3 0.4
90-120 0 0.0 0.0
90-150 0 0.0 0.0
90-180 0 0.0 0.0
0-180 1478 61.6 100.00
**Efficiency=61.6%**
REPORT NO: LRL 499-9F2
REPORT PREPARED FOR: LIGHTOLIER
REPORT BY: LIGHTING RESEARCH
LABORATORY, INC.
DESCRIP: 7.5” DIA. RECESSED DOWNLIGHT
WITH COMFORT CLEAR™ REFLECTOR
LAMPS: 1PL-T 32W LUMENS=2400
Spacing Ratio = 1.1
Spacing Ratio
0°
5°
15° 25°
35°
45°
55°
65°
75°
85°
1000
1200
600
800
400
200
EFFECTIVE FLOOR CAVITY REFLECTANCE = .20
80 70 50 30 10
50 30 10 50 30 10 50 30 10 50 30 10 50 30 10 0
1 .66 .65 .64 .65 .64 .63 .63 .62 .61 .60 .60 .59 .58 .58 .57 .56
2 .62 .60 .58 .61 .59.57 .59.58 .56 .57 .56 .55 .56 .55 .54 .53
3 .58 .55 .53 .57 .55 .53 .56 .54 .52 .54 .53 .51 .53 .52 .50 .50
4 .55 .52 .49 .54 .51 .49 .53 .50 .48 .52 .50 .48 .51 .49 .47 .46
5 .51 .48 .46 .51 .48 .45 .50 .47 .45 .49 .46 .45 .48 .46 .44 .43
6 .48 .45 .42 .48 .45 .50 .47 .44 .42 .46 .44 .42 .45 .43 .41 .41
7 .45 .42 .39 .45 .41 .39 .44 .41 .39 .43 .41 .39 .43 .40 .38 .38
8 .42 .39 .36 .42 .38 .36 .41 .38 .36 .40 .38 .36 .40 .37 .36 .35
9 .39 .36 .33 .39 .35 .33 .38 .35 .33 .38 .35 .33 .37 .35 .33 .32
10 .37 .33 .31 .36 .33 .31 .36 .33 .31 .35 .32 .30 .35 .32 .30 .30
WALL REFLECTANCE
ROOM CAVITY RATIO
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Compact Fluorescent Surface Cylinder CS7142
Page 2 of 2 7 3/8" Aperture Triple Tube (4-Pin) Ceiling & Wall Mount
Lightolier a Genlyte Thomas Company www.lightolier.com
631 Airport Road, Fall River, MA 02720 • (508) 679-8131 • Fax (508) 674-4710
We reserve the right to change details of design, materials and finish.
© 2002 Genlyte Thomas Group LLC (Lightolier Division) • A0902
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