Specification

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COEFFICIENTS OF UTILIZATION - ZONAL CAVITY METHOD
EFFECTIVE FLOOR CAVITY REFLECTANCE: 20%
RCC %:
80
70
50
30
10
0
RW %:
70
50
30
0
70
50
30
0
50
30
20
50
30
20
50
30
20
0
RCR: 0
1.19
1.19
1.19
1.19
1.16
1.16
1.16
1
1.11
1.11
1.11
1.06
1.06
1.06
1.02
1.02
1.02
1
1
1.09
1.04
1
0.96
1.06
1.02
0.98
0.85
0.97
0.94
0.91
0.94
0.91
0.89
0.9
0.88
0.86
0.84
2
0.99
0.91
0.84
0.78
0.96
0.89
0.82
0.71
0.85
0.8
0.75
0.82
0.77
0.73
0.79
0.75
0.72
0.7
3
0.9
0.79
0.71
0.64
0.87
0.78
0.7
0.6
0.75
0.68
0.63
0.72
0.66
0.62
0.69
0.65
0.61
0.58
4
0.82
0.7
0.61
0.54
0.8
0.69
0.6
0.51
0.66
0.59
0.53
0.64
0.58
0.52
0.62
0.56
0.52
0.5
5
0.75
0.62
0.53
0.47
0.73
0.61
0.53
0.45
0.59
0.52
0.46
0.57
0.51
0.45
0.55
0.49
0.45
0.43
6
0.7
0.56
0.47
0.41
0.68
0.55
0.47
0.39
0.53
0.46
0.4
0.52
0.45
0.4
0.5
0.44
0.39
0.37
7
0.64
0.51
0.42
0.36
0.63
0.5
0.42
0.35
0.48
0.41
0.35
0.47
0.4
0.35
0.46
0.39
0.35
0.33
8
0.6
0.46
0.38
0.32
0.58
0.46
0.37
0.31
0.44
0.37
0.31
0.43
0.36
0.31
0.42
0.36
0.31
0.29
9
0.56
0.42
0.34
0.29
0.55
0.42
0.34
0.28
0.41
0.33
0.28
0.4
0.33
0.28
0.39
0.32
0.28
0.26
10
0.52
0.39
0.31
0.26
0.51
0.39
0.31
0.25
0.38
0.3
0.26
0.37
0.3
0.25
0.36
0.3
0.25
0.24
Application Reference
Open Area
40’long x 24'wide x 9’ceiling, 80/50/20 reflectance, 0.8 LLF, Calculation grid at 2.5’
Spacing
Number of Luminaires
Maintained Average Illumination
Max./Min.
Input Power per
Luminaire
Watts/ Sq. foot
8’x8’
15
42fc
2.36
42W
0.66
8’x10’
15
39fc
1.88
42W
0.66
10’x10’
12
31fc
2.35
42W
0.53
10’x12’
12
30fc
1.65
42W
0.53
Corridor
100’long x 5'wide x 9’ceiling, 80/50/20 reflectance, 0.8 LLF, Calculation grid at 2.5’
Spacing
Number of luminaires
Maintained Average Illumination
Max. /Min.
Input Power per
Luminaire
Watts/ Sq. foot
12’
9
26fc
1.75
42W
0.76
14’
8
23fc
2.3
42W
0.68
16’
7
20fc
3
42W
0.59