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Assessment of Solid-State Lighting, Phase Two (2017) / Chapter Skim
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Appendix C: Nomenclature and Definitions
Pages 92-99

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From page 92...
... Lumi- FIGURE C.1  Luminous flux. naire examples include chandeliers, downlights, table lamps, wall sconces, recessed or pendant mounted luminaires, and exterior streetlights.
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From page 93...
... It is important to note that efficacy is different from The luminous efficacy of a lighting product is the ratio efficiency. The efficiency of a lighting system is the ratio of the luminous flux to the total electrical power consumed between the obtained efficacy and the theoretical maximum and has units of lumens per watt (lm/W)
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From page 94...
... when assuming that the theoretical maximum lamp efficacy is 408 lm/W. NOTE: CFL = com- The color of emitted light as perceived by people, called pact fluorescent lamp; HID = high-intensity discharge lamp; LED chromaticity, is regulated by the spectral composition.
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From page 95...
... Though color rendering is determined by 5,000 K Lower CCTs include more light nearer the red end the spectral output of a light source, it cannot be predicted of the visible spectrum and are perceived to be "warmer," by a cursory inspection of the shape of the spectral power while higher CCTs tend toward the blue end and are per- distribution and subtle differences in SPD can produce ceived to be "cool." In somewhat of a misnomer, the label- marked differences in the chromaticity of illuminated objects ing is indicative of the feelings they evoke rather than their (Ohno, 2005)
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From page 96...
... . The dashed green curves show the Spectral Luminous Efficiency Function, and the black curves are light source's spectral power distributions.
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From page 97...
... Halogen lamps are incandescent lamps in which the Good color rendering can be achieved with such discon- tungsten filament has been enclosed in a capsule containing tinuous light spectra because of the properties of the other a halogen gas, typically bromine, which allows the filament two elements in the process of perceiving object colors: the to operate at a slightly higher temperature without reducreflectance of the objects and the absorption of the cone ing the rated life and resulting in a somewhat higher light photopigments in the human visual system. All objects, output than the standard incandescent lamp.
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From page 98...
... . Both CFLs and linear fluorescent lamps produce light by exciting phosphors, which then fluoresce, with ultraviolet energy.
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From page 99...
... 2005. Spectral design considerations for white led color rendering.
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Key Terms

  • luminous flux
  • luminous efficacy
  • white light
  • light sources
  • spectral power

  • incandescent lamps
  • color rendering
  • human visual
  • visible spectrum
  • produce light

  • fluorescent lamps
  • color quality
  • power distribution
  • screw base
  • incandescent lamp

  • compact fluorescent
  • lighting product
  • emit light
  • spectral luminous
  • white led

  • fluorescent lamp
  • lighting technologies
  • lamps produce
  • luminous intensity
  • produces white

  • standard incandescent
  • state lighting
  • solid state
  • upper bounds
  • combining red


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