Summary Lighting Technology

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Summary - Lighting Technology

  • 1 Light and Radiation

  • Qph
    Energy of a photon
  • h
    Planck's constant 6.626 *10^-34 Ws
  • The propagation speed in a medium is dependent on ...
    the refractive index n
  • Optical radiation ranges from ...nm to ...nm
    1nm - 1000 nm
  • 2.1 Transition from radiometric to photometric quantities

  • Xe; where does the e stand for?
    energy -> indicates that this is a radiometric quantity
  • What is the relative sensitivity
    Relative to a reference wavelength [lambda0]
  • What is the maximal eye sensitivity for photopic and scotopic vision?
    p: 555nm s: 507nm
  • What follows an additivity theorem so that the transition from a spectral power distribution of a radiometric quantity follows a function?
    Brightness perception
  • 2.2 Photometric quantities

  • Illuminance (symbol)
    E in lux=lm/m2
  • Cylindrical illuminance
  • Semicylindrical illuminance
  • A planar angle is formed..
    by two rays originating in the same point called vertex
  • A solid angle is formed by ...
    a bundle of rays originating in the same point forming an area
  • Luminous intensity (symbol)
    I in candela [cd] = lm/sr -- used to characterize the distribution of a lamp
  • Luminance (Symbol)
    L in cd/m2 -- impacts brigtness perception
  • Luminous existance
    M in lm/m2
  • Luminous energy
    Q in lms or lmh
  • Luminous exposure
    H in lxs or lxh
  • 2.3 Photon quantities

  • Eph
    Energy of one photon
  • Photon irradiance
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Radiosity algorithm
Mo,i: initial luminous flux exitance 
Mj: light received from other patches
When taking into account the obstruction of each point on Ai towards each point on Aj
Form factor from patch i to patch j
Form factor of finite patch i to differential patch j
The form factor between a differential patch area to a finite area
The differential luminous flux leaving dAi towards dAj (two infinitely small areas)
Form factor between two areas Ai and Aj defined as the luminous flux O|ij from Ai->Aj. o|i is the luminous flux incident on Ai
Light output ratio Nlb and the utilance nr are often combined to utilization factor nb
Zonal cavity method
nR,K: utilance of a reference surface ratio of luminous flux hitting this surface to the total luminous flux provided by the n luminaires in the room
The direct illuminance caused by the luminaire can be calculated by the superposition of the contributions of each partial luminaire