*Attention:* The IES website is still undergoing updates. We will send out an email once all systems have been restored. We apologize for the inconvenience and appreciate your patience. Before signing in, Please click here to confirm your account.

DonateJoinSign In

beam axis of a projector

[] A line midway between two lines that intersect the candlepower distribution curve at points equal to a stated percentage of its maximum (usually 50%).

« Back to Definitions Index