One of the most common questions that facility and operation managers ask is “How much light do I need to properly illuminate my facility?” Since 1958, the Illuminating Engineering Society has been publishing recommended illuminance levels for a multitude of tasks and facility types in table form.  The published tables provide guidance for both generic tasks and hundreds of very specific tasks.  In order to understand these tables, it’s best to start with an overview of how light is measured. This article gives a brief explanation of how light is measured and provides … Continue reading