Education seminars provide up-to-date information on the latest in lighting design, technique, and technologies. Furthermore, you can earn valuable CEU and LEU credits by taking part. Check back soon for a comprehensive list of upcoming educational seminars and events! The Illuminating Engineering Society (IES) presents GloMat, a Global Manufacturer Training Program. Through seven modules learn the United States lighting landscape through distribution and sales, events, standards and regulations, and more. GloMat features sequenced courses carefully curated by lighting experts with a free Introduction Module. About this Course The IES offers a series of webinars that provide supplemental education to coincide with a recently revised or new IES Standard (Recommended Practice - RP, Technical Memorandum - TM, etc.). RP-11, Lighting for Interior and Exterior Residential Environments is part of the IES Standards Webinars. Description: This new Recommended Practice provides design criteria for the many. A Community Dedicated to Lighting Excellence The IES Boston Section supports lighting professionals through education, knowledge exchange, and professional development, fostering better lighting practices for our built environment. [9.4.7] The ratio of the luminous flux (lumens) received on the work plane to that emitted by the luminaire. Note: This ratio sometimes is called interflectance. Room utilization factor is based on the flux emitted by a complete luminaire, whereas coefficient of utilization, CU, is based on the total flux generated by the lamps in a luminaire. « Back to Definitions Index The ratio of luminous flux (lumens) calculated as received on the work plane to the total luminous flux (lumens) emitted by the lamps alone. It is equal to the product of room utilization factor and luminaire efficiency. store.ies.org.