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| RP-8 Photometric Comparator |
Beta Version 1.10
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Testing Luminaire ( File Name: 250W-T3-HPS-cobrahead.ies ) to RP-8 lighting standard
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| Manufact: | (left blank)
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Cat. Number: |
(left blank)
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| Filename: | (left blank) |
Test Report: |
(left blank)
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| Lumens: |
Relative Photometry 28500.0
| Watts: | 297.0 |
| General: |
Horiz: 180° Vert: 90° |
Luminaire Efficacy: 96.0 Lm/W |
The following information is derived from settings and the IES file entered on Page 1. Settings have ± 2% thresholds.
| | Table shows results for filename: T3-HPS-cobrahead.ies as an outdoor luminaire mounted at 25 ft.
- - - - Horizontal° - - - - | |
| | 22.5° |
45° |
67.5° |
90° |
112.5° |
135° |
157.5° |
180° |
202.5° |
225° |
247.5° |
270° |
292.5° |
315° |
337.5° |
360° |
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| Vertical | |
+80° Candella Percentages
| Classification = Full Cutoff | Threshold = [%]
Avg. % |
| 180° |
0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 [0] |
| 135° |
0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 [0] |
| 90° |
0.0 | 0.2 | 0.3 | 0.2 | 0.5 | 0.6 | 0.3 | 0.3 | 0.3 | 0.3 | 0.6 | 0.5 | 0.2 | 0.3 | 0.6 | 0.0 | 0.3 [10] |
| 85° |
1.6 | 2.7 | 3.6 | 4.3 | 6.3 | 5.8 | 4.3 | 4.7 | 4.7 | 4.3 | 5.8 | 6.3 | 4.3 | 3.6 | 11.5 | 1.6 | 4.7 [10] |
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Vertical FC 60" above
pavement, radius-feet from light (symmetrical) | Horiz
Radius |
| 80° |
0.02 | 0.02 | 0.13 | 0.15 | 0.07 | 0.02 | 0.01 | 0.02 | 0.02 | 0.01 | 0.02 | 0.07 | 0.15 | 0.13 | 0.02 | 0.02 | 113 ft |
| 75° |
0.22 | 0.32 | 1.35 | 1.22 | 0.39 | 0.14 | 0.14 | 0.11 | 0.11 | 0.14 | 0.14 | 0.39 | 1.22 | 1.35 | 0.32 | 0.22 | 75 ft |
| 70° |
0.60 | 0.75 | 2.51 | 2.51 | 1.15 | 0.63 | 0.41 | 0.29 | 0.29 | 0.41 | 0.63 | 1.15 | 2.51 | 2.51 | 0.75 | 0.60 | 55 ft |
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| | Horizontal FC on pavement, radius-feet from light @ 25-ft height | |
| 80° |
0.00 | 0.00 | 0.01 | 0.02 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.02 | 0.01 | 0.00 | 0.00 | 142
ft |
| 75° |
0.04 | 0.05 | 0.23 | 0.21 | 0.07 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.07 | 0.21 | 0.23 | 0.05 | 0.04 | 93
ft |
| 70° |
0.14 | 0.17 | 0.59 | 0.59 | 0.27 | 0.15 | 0.10 | 0.07 | 0.07 | 0.10 | 0.15 | 0.27 | 0.59 | 0.59 | 0.17 | 0.14 | 69
ft |
| 65° |
0.31 | 0.36 | 0.95 | 1.04 | 0.55 | 0.34 | 0.23 | 0.17 | 0.17 | 0.23 | 0.34 | 0.55 | 1.04 | 0.95 | 0.36 | 0.31 | 54
ft |
| 60° |
0.51 | 0.69 | 1.20 | 1.47 | 0.87 | 0.62 | 0.44 | 0.33 | 0.33 | 0.44 | 0.62 | 0.87 | 1.47 | 1.20 | 0.69 | 0.51 | 43
ft |
| 55° |
0.79 | 1.08 | 1.55 | 1.77 | 1.37 | 1.06 | 0.80 | 0.62 | 0.62 | 0.80 | 1.06 | 1.37 | 1.77 | 1.55 | 1.08 | 0.79 | 36
ft |
| 45° |
2.22 | 2.65 | 3.54 | 3.57 | 2.97 | 2.32 | 1.86 | 1.75 | 1.75 | 1.86 | 2.32 | 2.97 | 3.57 | 3.54 | 2.65 | 2.22 | 25
ft |
| 20° |
8.33 | 8.76 | 8.89 | 8.41 | 7.65 | 6.76 | 6.23 | 6.05 | 6.05 | 6.23 | 6.76 | 7.65 | 8.41 | 8.89 | 8.76 | 8.33 | 9
ft |
| | -verse | |
Longitudinal | |
Transverse | | Longitudinal |
| Trans- | |
Min. = 0.07 fc (underlined) Avg. = 1.76 fc (± 15% underlined) Avg/Min uniformity ratio =
25:1 |
Red indicates parameter is outside IESNA RP-8 criteria.
Blue > 1/2 min. illuminance can be raised to standard with a like fixture overlapping that coverage line
Highlighted Blue Horiz Radius indicates where additional luminaires may be required to meet min. illuminance
Results:
Type: Symmetrical
Horizontal illuminance at 69.0 feet will limit
spacing to less than 138 ft. centers.
Vertical illuminance at 113.0 feet will limit spacing to less than 226 ft. centers.
Vertical illuminance will cause glare.
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Notes
- The results can suggest maximum spacing of like luminaires required to meet prescribed illumination levels, from which a total count per area may be derived
- Glare usually results when the luminaire has a significant output level at an angle greater than 70° from the vertical axis.
- Illuminance is additive. Adjacent luminaire coverage may be overlapped to raise readings up to standard, e.g. if blue print begins at 15-ft, another like luminaire mounted on 30-ft centers with its same side overlapping that same line would double that reading
- Type-I luminaires have lobes at 0° & 180° OR 90° & 270°. Type-V may have those 4 lobes or have none at all
- The IESNA Security Lighting Committee recommends that for facial identification, the minumum vertical illuminance should be 0.5 fc
- The IESNA recommends that vertical illuminance should be at least 1/2 the horizontal illuminance at the lowest unshadowed point between luminaires
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This service provides a quick, simple assessment of lighting comparison to ascertain minimum
wattage and luminaire count. The intended purpose is improved data for calculation of ROI and payback.
Seek a thorough lighting layout by a professional before committing a lighting project.
© 2011 Patrick Mullins, all rights reserved
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