[10.3.6] A long recessed lighting unit usually installed with the opening flush with the ceiling. The term is derived from “trough” and “coffer.”
« Back to Definitions Index*Attention:* The IES website will be temporarily unavailable from May 9th to May 13th for site updates. We apologize for any inconvenience and will provide an update closer to the time. Thank you for your continued support of the Illuminating Engineering Society.
