RLM Explained
Our expert enlightens a reader on the origins (and new interest) in RLM fixtures.
 
What does RLM stand for? Everyone knows what they are, how to specify them etc., but no one seems to know what RLM means. Help!
These days it means reflector luminaire manufacturer, but originally it meant reflector light microscopy. It is a fixture that is designed to project light downward, which has gained new interest in communities with Dark Sky ordinances.
Randall Whitehead, IALD

Randall Whitehead, IALD, is a professional lighting designer and author. His books include "Residential Lighting, A Practical Guide." Whitehead has worked on projects worldwide, appeared on the Discovery Channel, HGTV and CNN, and he is regular guest on Martha Stewart Living Radio. Visit his website www.randallwhitehead.com for more information on books, upcoming seminars and the latest lighting trends.

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