5 Colo. Code Regs. § 1003-5-3.19
All pools constructed with underwater lighting shall have not less than 500W/1000 sq.ft. of pool surface area. All indoor pools and all outdoor pools operated at night shall have artificial lighting sufficient to permit the maindrains to be clearly visible, at all times. Such lights shall be spaced to provide illumination so that all portions of the pool may be readily seen without glare. Area lighting shall provide at least 0.6 W per square foot of deck area and/or surrounding area within the enclosure around the pool. If such light is used for night swimming, area and pool lighting combined shall provide at least 10-foot candles of illumination per square foot of pool area. Ground fault interrupters shall be provided for all lights and electrical outlets of the pool complex, including dressing rooms and mechanical equipment rooms. All electrical wiring shall conform with the current National Electrical code of the National Underwriters Laboratory or equivalent. No overhead electrical wiring shall pass within 20 feet of the pool enclosure.
5 CCR 1003-5-3.19