On or before April first, nineteen hundred eighty, the commissioner shall promulgate, and thereafter may amend from time to time, standards relating to the lighting of all existing buildings, or classes of such buildings, for purposes of minimizing the consumption of energy and providing for the efficient utilization of the energy expended for lighting in the use and occupancy of such buildings. Such standards shall be cost effective and shall not impair the health and safety of the occupants of the property. The standards shall be deemed cost effective if the cost of implementing them would be equal to or less than the present value of energy and maintenance savings that would be expected over a seven-year period in a building to which the standards are applicable.
New York Legal Code