Luminous Flux, Luminous Intensity, Quantity of Light

  • H. A. E. Keitz
Part of the Philips Technical Library book series


Light sources emit energy in the form of electromagnetic waves which spread out in all directions. The amount of energy radiated during a unit of time (the power) may be expressed in physical units as ergs per second, or in watts. Apart from the total energy, we may also consider the amount of energy passing through a certain part of a plane, or within a certain solid angle, and express this in the same units.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1).
    G. Heller, Ph. T. R. *) 5, 1940, 1–5. “The new luminous Standard”Google Scholar
  2. W. de Groot, Ph. T. R. 10, 1948, 150–153. “The New Candle”Google Scholar
  3. J. W. T. Walsh, W. Barnett, R. G. Berry and J. S. Preston, Proc. Inst. Electr. Eng. 108, 1961, 173–181. “Units and standards of light maintained at the National Physical Laboratory, 1915–1960.”Google Scholar

Copyright information

© N. V. Philips’ Gloeilampenfabrieken, Eindhoven (The Netherlands) 1971

Authors and Affiliations

  • H. A. E. Keitz

There are no affiliations available

Personalised recommendations