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American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) 90.1 Standing Standard Project Committee (SSPC) for their insight. The same energy efficiency level can be achieved with the following less expensive solution: occupancy sensors automatically shutting-off one-third of the lamps when there is no activity detected for no more than 30 minutes and time-clock control for the remaining two-thirds of the lamps. originally done by COMNET for the Standard 90.1-2016 Commercial Building Energy Modeling Guidelines and Procedures and by CEC for the NACM Reference Manual. Compare lighting and lighting control requirements for IECC, ASHRAE 90.1. As it is not acceptable to turn-off all luminaries during opening-hours in car parks due to security and safety reasons, this requirement implies the installation of dimmable luminaries - which is expensive. Understand the varied and complex issues associated with building energy codes. According to ASHRAE Standard 90.1-2010, “lighting shall be controlled by one or more devices that automatically reduce lighting power of each luminaries by a minimum of 30% when there is no activity detected within a lighting zone for no more than 30 minutes”.