| Lytecaster® Recessed Downlighting 1178T |
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Page 2 of 2 | 6 3/4” Aperture Low Profile Dropped Diffuser Reflector Trim |
INITIAL FOOTCANDLES | 60 |
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| ROOM SURFACE REFLECTANCES: | ||
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50 |
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| 80% Ceiling; 50% Walls; 20% Floor | |||
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| 1800 Lumens Per Lamp |
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40 |
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| Large Room (RCR =1) |
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| Small Room (RCR =5) |
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30 |
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AVERAGE |
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20 |
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| 10 |
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| 10 | 20 | 30 | 40 | 50 | 60 | 70 |
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| AREA PER FIXTURE IN SQUARE FEET |
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| 2 | 3 | 4 | 5 | 6 | 7 |
| 8 |
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| CENTER TO CENTER DISTANCE OF FIXTURES IN FEET |
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Use quick calculator chart to determine the spacing of 2 Lt. 26 Watt Quad Tube units for a desired level of illumination. Conversion Factors: 2 Lt. - 18W Quad Tube, F.C. x 0.7; 2 Lt. - 13W Twin Tube, F.C. x 0.55.
coefficients of utilization
% effective ceiling cavity reflectance
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| 80 |
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| 70 |
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| 50 |
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| 30 |
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| 0 |
| 0 |
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| % | wall reflectance |
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| 50 | 30 | 10 | 50 | 30 | 10 |
| 50 | 30 | 10 | 50 | 30 | 10 | 50 | 30 | 10 |
| 0 |
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| .15 |
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| 1 | .22 | .21 | .20 | .21 | .20 | .19 |
| .19 | .19 | .18 | .18 | .18 | .17 | .17 | .17 | .16 |
| .13 |
ratio | 2 | .19 | .17 | .16 | .18 | .17 | .15 |
| .17 | .16 | .15 | .16 | .15 | .14 | .15 | .14 | .13 |
| .10 | |
3 | .16 | .14 | .13 | .16 | .14 | .13 |
| .15 | .13 | .12 | .14 | .13 | .12 | .13 | .12 | .11 |
| .09 | ||
4 | .14 | .12 | .11 | .14 | .12 | .11 |
| .13 | .12 | .10 | .12 | .11 | .10 | .12 | .10 | .10 |
| .08 | ||
cavity |
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5 | .13 | .11 | .09 | .12 | .10 | .09 |
| .12 | .10 | .09 | .11 | .10 | .08 | .10 | .09 | .08 |
| .07 | ||
6 | .11 | .09 | .08 | .11 | .09 | .08 |
| .10 | .09 | .08 | .10 | .08 | .07 | .09 | .05 | .07 |
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Room | 7 | .10 | .08 | .07 | .10 | .08 | .07 |
| .09 | .08 | .06 | .09 | .07 | .06 | .08 | .07 | .06 |
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8 | .09 | .07 | .06 | .09 | .07 | .06 |
| .08 | .07 | .06 | .08 | .07 | .05 | .08 | .06 | .05 |
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9 | .08 | .06 | .05 | .08 | .06 | .05 |
| .08 | .06 | .05 | .07 | .06 | .05 | .07 | .06 | .05 |
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| 10 | .08 | .06 | .05 | .07 | .06 | ..05 |
| .07 | .05 | .04 | .07 | .05 | .04 | .06 | .05 | .04 |
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20% Floor cavity reflectance
Conversion factors: 18W Quad Tube, C.U. x 1.0 3W Twin Tube, C.U. x 1.1
spacing ratio = 1.3
certified test reported no. 0160FR
computed by lsI program
recessed lytecaster downlight
6 1/4” dia. aperture, white reflector with drop diffuser two 26w quad tube 2 pin lamps. lumen rating = 1800 lms.
across 45 Along
100
200
tested according to ies procedures. test distance exceeds five times the greatest luminous opening of luminaire.
CANDLEPOWER SUMMARY
angle | along | 22.5 | 45 | 67.5 across lumens | ||
0 | 187 | 187 | 187 | 187 | 187 |
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5 | 187 | 188 | 190 | 185 | 185 | 18 |
10 | 185 | 187 | 189 | 183 | 181 |
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15 | 183 | 184 | 187 | 181 | 178 | 52 |
20 | 179 | 180 | 183 | 177 | 175 |
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25 | 174 | 176 | 178 | 172 | 170 | 81 |
30 | 168 | 169 | 172 | 166 | 164 |
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35 | 161 | 162 | 165 | 159 | 156 | 101 |
40 | 153 | 154 | 157 | 150 | 148 |
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45 | 144 | 145 | 148 | 141 | 139 | 111 |
50 | 134 | 135 | 137 | 131 | 129 |
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55 | 123 | 124 | 127 | 120 | 117 | 110 |
60 | 111 | 113 | 116 | 108 | 105 |
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65 | 99 | 102 | 103 | 95 | 91 | 98 |
70 | 86 | 89 | 89 | 85 | 79 |
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75 | 70 | 74 | 73 | 75 | 65 | 77 |
80 | 55 | 57 | 60 | 63 | 51 |
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85 | 39 | 41 | 46 | 50 | 38 | 49 |
ZONAL LUMENS AND PERCENTAGES
ZONE | LUMENS | % LAMP | % LUMINAIRE |
150 | 4.17 | 19.19 | |
251 | 6.98 | 32.10 | |
472 | 13.12 | 60.34 | |
696 | 19.34 | 88.94 | |
444 | 12.36 | 56.84 | |
223 | 6.22 | 28.60 | |
86 | 2.41 | 11.06 | |
782 | 21.75 | 100.00 |
** efficiency = 21.7% **
Job Information | Type: |
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Lightolier a Genlyte company | www.lightolier.com |
631 Airport Road, Fall River, MA 02720 • (508)
© 2006 Genlyte Group LLC • E1006