(Effective July 1, 2023)
Section C405.3—Lighting for plant growth and maintenance.
C405.3 Lighting for plant growth and maintenance. All permanently installed luminaires used for plant growth and maintenance shall have a photosynthetic photon efficacy measured at the lamp for luminaires with serviceable or removable lamps or at the luminaire for integrated, nonserviceable luminaires of not less than 1.7 µmol/J for greenhouses and not less than 1.9 µmol/J for all other indoor growing spaces as defined in accordance with ANSI/ASABE S640.
Buildings with no more than 10 kW of aggregate horticultural lighting load.