1. CIE 097:2005 Maintenance of indoor electric lighting systems (2005)
2. EN12464-1 “Lighting of work places – Part 1: Indoor work places”
3. Pacific Northwest National Laboratory, Lumen Maintenance and Light Loss Factors: Consequences of Current Design Practices for LEDs, Solid-State Lighting Program Building Technologies Program Office of Energy Efficiency and Renewable Energy U.S. Department of Energy, September 2013.
http://www.pnnl.gov
. Accessed 15 Mar 2017
4. Sanders, A.: Scott, Review of Illuminaiure Maintenance Factors. Mott Macdonald, December 2008
5. ETAP NV, The Maintenance Factor for Led Lighting, White paper, February 2013