Luminous Efficacy

876 views

Published on

Efficacy, power and costs of high brightness LEDs have got levels that make them an attractive solution in many lighting system applications.

The luminous efficacy of a light source is the ratio between the emitted luminous flux and the amount of the absorbed energy to transmit it. It is expressed in lumen/watt (lm/W). The lumen, the measure unit of the luminous flux, is equal to the luminous flux detected in a solid angle of one steradian and emitted towards all directions from a source with a luminous intensity of 1 candle. (the steradian –sr symbol- is the SI unit of solid angle and it is defined as " the solid angle subtended at the center of a sphere of radius r by a portion of the surface of the sphere having an area r ²".

Published in: Technology, Business
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
876
On SlideShare
0
From Embeds
0
Number of Embeds
16
Actions
Shares
0
Downloads
29
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Luminous Efficacy

  1. 1. Luminous Efficacy http://dev.emcelettronica.com/print/51770 Your Electronics Open Source (http://dev.emcelettronica.com) Home > Blog > Emanuele's blog > Content Luminous Efficacy By Emanuele Created 16/04/2008 - 10:36 BLOG Diodes by Franco Musiari [ Assipe [1]] Efficacy, power and costs of high brightness LEDs have got levels that make them an attractive solution in many lighting system applications. The luminous efficacy of a light source is the ratio between the emitted luminous flux and the amount of the absorbed energy to transmit it. It is expressed in lumen/watt (lm/W). The lumen, the measure unit of the luminous flux, is equal to the luminous flux detected in a solid angle of one steradian and emitted towards all directions from a source with a lu

×