
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)
8
CANDLEPOWER SUMMARY
ANGLE AVERAGE CP LUMENS
180 0
175 00
165 00
155 00
145 00
135 00
125 00
115 00
105 00
95 00
85 22
75 44
65 55
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
83
40
45
20
67
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)
8
w
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
% 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
191 8.0 12.9
6 0.3 0.4
90 0.0 0.0
90 0.0 0.0
90 0.0 0.0
01478 61.6 100.0
*
TESTED ACCORDING TO IES PROCEDURES. TEST DISTANCE EXCEEDS FIVE TIMES THE
GREATEST LUMINOUS OPENING OF LUMINAIRE.
I
1
CANDLEPOWER SUMMARY
ANGLE AVERAGE CP LUMENS
180 0
175 00
165 00
155 00
145 00
135 00
125 00
115 00
105 00
95 00
85 11
75 22
65 33
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
Quick Calculator Quick Calculator
Calculit ®Compact Fluor sc nt Surfac Cylind r CS7142
Pag 2 of 2 7 3/8" Ap rtur Tripl Tub (4-Pin) C iling & Wall Mount
Lig tolier a G nlyt Thomas Company www.lightoli r.com
631 Airport Road, Fall Riv r, MA 02720 • (508) 679-8131 • Fax (508) 674-4710
W r s rv th right to chang d tails of d sign, mat rials and finish.
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