Here is a link and an overview of an article written by Jim Benya for Cree Lighting. A good paper for electrical engineers and architects.
James R Benya, PE, FIES, FIALD
Developed for Cree LED Lighting
May 15, 2011
With Addendum May 22, 2011
Revision June 6, 2011
Final version June 30, 2011 2 Design Calculations with Solid State Lighting
Abstract
For decades, lighting calculations have been the backbone of lighting designs for almost all lighting applications, indoors and out. Good practice in illuminating engineering dictates that the designer uses photometric data that is adjusted to meet the conditions of the intended application by accounting for temperature, dirt, and variations of components. With LED lighting systems, the photometric test method ("absolute photometry") differs from conventional source lighting ("relative photometry"). In order to properly predict the performance of an LED lighting system and to compare results to competing conventional lighting systems, designers must be particularly careful to use appropriate factors in addition to properly using the two different photometric data formats. A discussion of each of the factors and examples of comparative calculations are provided.
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