background image

Use quick calculator chart to determine spacing of luminaires 
for desired level of illumination.  
Conversion Factors: 
100W A21, F.C. X 0.6

(6' x 6' x 8.5' room)

(12' x 12' x 8.5' room)

(60' x 60' x 8.5' room)

80% Ceiling; 50% Walls; 20% Floor

Room Surface Reflectances:

2880 Lumens Per Lamp

RCR = 10

RCR = 5

RCR = 1

Clear Alzak with 150W A21

CENTER TO CENTER DISTANCE OF FIXTURES IN FEET

AREA PER FIXTURE IN SQUARE FEET

INITIAL FOOTCANDLES

14

13

12

11

10

9

8

7

6

5

4

3

180

160

140

120

100

80

60

40

20

80

70

60

50

40

30

20

10

Use quick calculator chart to determine spacing of luminaires 
for desired level of illumination. 
Conversion Factors: 
PAR38 FL: 100W(IR), F.C. X 1.5;  120W, F.C. X 1.4;  90W, F.C. X 0.
70W/60W(IR), F.C. X 0.8
BR30 FL: 85W, F.C. X 0.6 (S.R.=0.9); 75W, F.C. X 0.5 (S.R.=0.9); 

(6' x 6' x 8.5' room)

(12' x 12' x 8.5' room)

(60' x 60' x 8.5' room)

80% Ceiling; 50% Walls; 20% Floor

Room Surface Reflectances:

1400 Lumens Per Lamp

RCR = 10

RCR = 5

RCR = 1

Clear Alzak with 100W PAR38 FL

CENTER TO CENTER DISTANCE OF FIXTURES IN FEET

AREA PER FIXTURE IN SQUARE FEET

INITIAL FOOTCANDLES

11

10

9

8

7

6

5

4

3

120

100

80

60

40

20

80

70

60

50

40

30

20

10

300

600

90

60

30

900

1200

COEFFICIENTS OF UTILIZATION

EFFECTIVE CEILING CAVITY REFLECTANCE

80

70

50

30

10

0

ROOM CA

VITY RA

TIO

20% FLOOR CAVITY REFLECTANCE

Conversion Factor: 45W TO 120W PAR 38 FL, C.U. X 1.0. 65W TO 85W BR30 FL, C.U. X 0.85

50

30 10

50

30

10

50

30

10

50

30

10

50

30

10

0

1.01 1.00 .99 1.00

.98 .97 .96

.95 .94 .93

.92 .91

.90

.89

.89 .87

.97 .95 .93 .96

.94 .92 .93

.92 .90 .91

.89

88

.88

.87

.86 .85

.94 .91 .89 .93

.90 .88 .91

89 .87 .89

.87

86

.87

.86

.85 .84

.91 .88 .86 .90

.88 .85 .89

.86 .84 .87

.85 .83

.85

.84

.83 .82

.88

.85 .83 .87

.84 .82 .86

.84 .82 .85

.83 .81

.84

.82

.80 .79

.86 .83 .81 .85

.82 .80 .84

.82 .80 .83

.81 .79

.82

.80

.79 .78

. 83 .80 .78 .83

.80 .78 .82

.79 .78 .81

.79 .77

.80

.78

.77 .76

.81 .78 .76 .81

.78 .76 .80

.77 .76 .79

.77 .75

.79

.77

.75 .74

.79 .76 .74 .79

.76 .74 .78

.76 .74 .78

.75 .73

.77

.75

.76 .73

.77 .75 .72 .77

.75 .72 .77

74.

72 .76

.74 .72

.76

.73

.72 .71

1
2
3
4
5
6
7
8
9

10

% WALL REFLECTANCE

COEFFICIENTS OF UTILIZATION

EFFECTIVE CEILING CAVITY REFLECTANCE

80

70

50

30

10

0

ROOM CA

VITY RA

TIO

20% FLOOR CAVITY REFLECTANCE

50

30

10

50

30

10

50

30

10

50

30

10

50

30

10

0

.68 .66 .65 .66

.65 .64 .64

.63 .62 .62

.61 .60

.59

.59

.58 .57

.63 .61 .58 .62

.60 .58 .60

.58 .57 .58

.57 .55

.56

.55

.54 .53

.59 .56 .53 .58

.55 .53 .56

.54 .52 .55

.53 .51

.53

.52

.50 .49

.55 .51 .49 .54

.51 .48 .53

.50 .48 .51

.49 .47

.50

.48

.47 .46

.51 .47 .44 .50

.47 .44 .49

.46 .44 .48

.45 .43

.47

.45

.43 .42

.47 .43 .41 .47

.43 .41 .46

.43 .40 .45

.42 .40

.44

.42

.40 .39

.44 .40 .37 .43

.40 .37 .42

.39 .37 .42

.39 .37

.41

.38

.36 .35

.41 .37 .34 .40

.36 .34 .39

.36 .34 .39

.36 .34

.38

.35

.33 .33

.37 .34 .31 .37

.33 .31 .37

.33 .31 .36

.33 .31

.35

.33

.31 .30

.35 .31 .28 .35

.31 .28 .34

.31 .28 .34

.30 .28

.33

.30

.28 .27

1
2
3
4
5
6
7
8
9

10

% WALL REFLECTANCE

DEG

CP

ZONAL FLUX

0

1319

0

5

1266

120

15

1080

306

25

1130

523

35

588

369

45

421

326

55

123

110

65

6

6

75

2

2

85

0

0

90

0

0

ZONE

LUMENS

LAMP

FIXT

0-30

949

32.9

53.8

0-40

1318

45.8

74.8

0-60

1754

60.9

99.5

0-90

1763

61.2

100.0

90-180

0.0

0.0

0.0

0-180

1763

61.2

100.0

ZONAL SUMMARY

CANDLEPOWER SUMMARY

400

90

60

30

1200

1600

800

DEG

CP

ZONAL FLUX

0

4932

5

4382

404

10

3249

15

1805

541

20

777

25

373

196

30

173

35

72

57

40

45

45

38

30

50

34

55

29

20

60

0

65

0

0

70

0

75

0

0

80

0

85

0

0

90

0

ZONE

LUMENS

LAMP

FIXT

0-30

1141

81.56

91.37

0-40

1198

85.64

95.94

0-60

1249

89.25

99.99

0-90

1249

89.26

100.00

40-90

50

3.63

4.06

60-90

0

.01

.01

90-180

0

.00

.00

0-180

1249

89.26

100.00

ZONAL SUMMARY

CANDLEPOWER SUMMARY

Spacing Ratio = 1.1

Spacing Ratio =  0.4

Tested According to IES proce-
dures. Test distance exceeds five
times the greatest luminous open-
ing of Luminaire.

Certified test report No. 0847FR
Computed by LSI program

Efficiency = 89.3%

ITL, Inc. report No. 21590
Date: 2-9-77

Efficiency: 61.2%

150W A21

150W A21

Calculite

®

Incandescent Surface Cylinder

7018AO

Page 2 of 2

6” Aperture A Lamp / BR30 / PAR38

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.
© 2004 Genlyte Thomas Group LLC (Lightolier Division) • B0704

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