Read the summary and the most important questions on Reader BP&SE Lighting

• 1 Building & Light

• 1.1 The built environment and light

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• In architecture lighting can be described in three quality related terms, what are they?

  Form, Feeling, Function

• 1.2 What is light?

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• What are the two ways light can be described?

  1. As an (electromagnetic, EM) wave phenomenon
     
  2. As a continuing steems of flying energy packets (photons).

• What is the range of wavelengths the human eye is sensitive for?

  Wavelengths between 380 and 780 nm. This is called light

• What range of wavelengths has ultraviolet radiation?

  250-380 nm

• What is Wien's law of displacement?

  Wavelength range, in which a relatively large amount of radiation is emitted, shifts shorter wavelengths, so in this case, from the infrared to the visible part of the EM spectrum. This phenomenon is captured in Wien's law of displacement. Formula:
  labda_max*T=b

• What is the law of Stefan Boltzmann

  The total emittance of EM radiation increases as the temperature of the object is higher. Formula:
  M_total = epsilon*sigma*T^4

• 1.3 The light source: Quantities and Units

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• What are the two main sources of light in the built environment?

  The sun(natural light, daylight) and lamps (electric light)

• What is meant by the sun as a light source?

  Both the direct light of the sun, as the indirect sky-light that reaches the earth influenced by the atmosphere and clouds

• 1.3.1 Luminous Flux

• What is luminous flux?

  the emitted amount of radiation energy per second, which is weighted by the spectral sensitivity of photosensitive sensors in the human eye.

• What is the formula for luminous flux?

  Phi = Q_v/t [lumen (lm)]