Advertisement
Page 2 of 2
Lighting Data
2
2
18"
3
12 f.c.
12 f.c.
LIghTIng DaTa
ExAMPLE: With clear Alzak
and
®
60W BT15 units, located 18" from wall
and 2' on center, (matching downlights
2' on center), the illumination on the
wall 3' down from the ceiling is 12 f.c.
beneath and 12 f.c. between fixtures.
Footcandles on wall From multiple Units 60w BT15 Clear alzak®
UnITS 18 InChES FROm waLL
18"
1
9
7
9
20
20
20
2
3
16
16
16
11
11
11
4
8
8
8
5
6
5
5
5
4
4
4
7
3
3
3
8
2
2
2
9
Footcandle values are averaged and rounded off and are based on a minimum of five units.
Candlepower Curve
Down
Wall
Report 1266FR
Efficiency = 33.6%
DOWNLIGHT SPACING RATIO = 1.2
COEFFICIEnTS OF UTILIZaTIOn
% EFFECTIvE CEILING CAvITy REFLECTANCE
80
70
% WALL REFLECTANCE
50 30 10
50 30 10
50 30 10
1
.37 .37 .36
.37 .36 .35
.35 .35 .34
2
.35 .33 .32
.34 .33 .32
.33 .32 .31
3
.32 .31 .29
.32 .30 .29
.31 .30 .29
4
.30 .28 .27
.30 .28 .27
.29 .27 .26
5
.28 .26 .24
.28 .26 .24
.27 .25 .24
6
.26 .24 .22
.26 .24 .22
.25 .23 .22
7
.24 .22 .20
.24 .22 .20
.23 .21 .20
8
.22 .20 .19
.22 .20 .18
.21 .20 .18
9
.20 .18 .17
.20 .18 .17
.20 .18 .17
10 .19 .17 .15
.19 .17 .15
.18 .17 .15
20% FLOOR CAvITy REFLECTANCE
To convert lighting data for a lower wattage incandescent lamp of the same type, multiply the
footcandle (or candlepower) values by the ratio of the lumens of the two lamps.The coefficients of
utilization remain the same.
Lytecaster
Downlight
24"
30"
8
4
8
8
2
8
15
15
15
13
11
13
12
12
12
10
10
10
9
9
9
7
7
7
6
6
6
5
5
5
4
4
4
4
4
4
3
3
3
3
3
3
2
2
2
2
2
2
2
2
2
2
2
2
50
30
10
50 30 10
50 30 10
.34 .34 .33
.33 .33 .32
.32 .31 .31
.31 .31 .30
.30 .29 .28
.28 .28 .28
.28 .27 .26
.28 .27 .26
.26 .25 .24
.26 .25 .24
.25 .23 .22
.24 .23 .22
.23 .21 .20
.22 .21 .20
.21 .19 .18
.21 .19 .18
.20 .18 .17
.19 .18 .17
.18 .16 .18
.18 .16 .15
Recessed Downlighting
®
3 3/4" Aperture Deep Anodized Wall Washer Reflector Trim
0
0
.32
.29
.27
.25
.23
.21
.19
.18
.16
.15
Job Information
Lightolier
a Genlyte company
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.
© 2006 Genlyte Group LLC • E0906
Type:
www.lightolier.com
2095
Advertisement
