Luminaire Light Distribution Classifications
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Transcript of Luminaire Light Distribution Classifications
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Luminaire lightdistribution basics
Presented by Morgan Catha,Grandlite Product Development Engineer
September 26, 2014
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Photometry concepts
Lumen: A quantity of emitted light energy in the visible spectrum (“luminous flux”). Defined in terms of the sensitivity of the human eye to light. One lumen is 1/683 watts or more of visible light energy, depending on the spectrum of the light source.
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Candela: A measure of “luminous intensity”, defined as lumens per solid angle (measured in steradians). Expresses how much light is being emitted in a particular direction.
Photometry concepts
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Footcandle: A measure of “illuminance”, the amount of visible light energy falling on a surface. Defined as one lumen per square foot. Another common unit is “lux”, equal to one lumen per square meter.
Photometry concepts
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Luminance: An expression of the intensity of light leaving a surface in a particular direction. Measured in candelas per square meter.
Photometry concepts
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“Brightness”
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“Brightness”
‘"Brightness" should be used only for nonquantitative references to physiological sensations and perceptions of light.’
-- Federal Standard 1037C, the Federal Glossary of Telecommunication
Terms (1996)
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Photometric Testing
Rotating mirror Goniophotometer -- measures light output
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Grandlite goniophotometry
laboratory
Photometric Testing
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A type C rotating mirror goniophotometer is used to record candela values for each angle
Photometric Testing
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The candela values are stored in a .ies file
Photometric Testing
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Photometric Reports
Polar candela plot • Shows cross-sections of light intensity
• Useful for seeing the overall shape of a luminaire’s light distribution
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Photometric Reports
Isoilluminance plot • Shows lines of equal illuminance on target surface
• Useful for seeing how a luminaire illuminates the area around it
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Photometric Reports
Luminaire Classification System Graph • Shows backlight, uplight and glare by sector
• Useful for seeing how the BUG rating is determined
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B.U.G. Rating
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B.U.G. Rating
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B.U.G. Rating
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B.U.G. Rating
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B.U.G. Rating
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IES Cutoff Classifications
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IES Cutoff Classifications
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IES Cutoff Classifications
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IES Cutoff Classifications
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IES Roadway Types
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IES Roadway Types• Type I - Half-maximum candela trace falls between 1 MH LRL on the House side and 1 MH LRL on the Street side • Type II - Half-maximum candela trace on the Street side is beyond the 1 MH LRL but not beyond the 1.75 MH LRL • Type III - Half-maximum candela trace on the Street side is beyond the 1.75 MH LRL but not beyond the 2.75 MH LRL • Type IV - Half-maximum candela trace on the Street side is beyond the 2.75 MH LRL • Type V - Has circular symmetry being essentially the same at all lateral angles around the luminaire • Type VS - Zonal lumens (below 90-degress vertical) for each of the eight horizontal octants (0-45, 45-90, 90-135, 135,180, 180-225, 225-270, 270-315, 315-360) are within +-10% of the average zonal lumens of all octants
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IES Roadway Types• Very Short (VS): The maximum intensity points to a point in the VS zone of the grid, 0-1.0 MH TRL
• Short (S): The maximum intensity points to a point in the S zone of the grid, 1.0 - 2.25 MH TRL
• Medium (M): The maximum intensity points to a point in the M zone of the grid, 2.25 - 3.75 MH TRL
• Long (L): The maximum intensity points to a point in the L zone of the grid, 3.75 - 6.0 MH TRL
• Very Long (VL): The maximum intensity points to a point in the VL zone of the grid, > 6.0 MH TRL
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IES Roadway Types
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IES Roadway Types• Maximum candela point furthest lateral point between 2.25 and 3.75 mounting heights = Medium
• Half maximum candela trace furthest longitudinal point between 1.75 and 2.75 mounting heights = Type 3
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IES Flood Types
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IES Flood Types
BeamField
10% of maximum candela
50% of maximum candela
Maximum candela
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IES Flood Types
Example: NEMA 7x7 means the field angle is 130 degrees or wider in both the horizontal and vertical planes. For short, “NEMA 7”.