Hello, 

Can anyone tell me what version of the IESNA Lighting Handbook we are required to follow for residential "dwelling units" lighting. The Multifamily Energy Model Simulation Guidelines refer to the Lighting Handbook, but not which version.  We are working on a v4 project and there is a 1995 verson, a 2017, and a 2020 of the handbook. Does anyone know this or can point me to where the USGBC specifically refers to which version? 

Thanks,