The Zonal Cavity lighting calculation method, sometimes referred to as the Lumen Method , calculates the average maintained horizontal illuminance on a work plane. We'll discuss the basic equation and then build on it until we have the final equation needed to carry out a design. Examples will be given as we go along to help illustrate.
Let's start with the basics first. Since illuminance is a measure of the luminous flux or rate of light flow falling on a surface area, we can write the basic expression
And Furthermore . . .
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Basic Equation Understanding Lumen Equation Improvements to Basic Equation CU & LLF |
Coefficient of Utilization Light Loss Factors Final Equation Example - Zonal Cavity |
