An owner shall ensure that an indoor recreational pool, semipublic pool, or public spa, or one used during nighttime, is provided with: Even illumination of the water, deck, and walkways; Illumination of the water and deck that is: A combination of underwater lighting and deck lighting so that the: Underwater lighting yields at least 0.5 watt per square foot of water surface area; and Deck lighting yields at least 0.6 watt per square foot of required deck area or at least 15 footcandles; or Overhead lighting yielding at least 2 watts per square foot of required deck area or at least 20 footcandles of light that is directed onto the deck and the water surface so that the entire pool or spa bottom is clearly visible; Lighting that minimizes reflection from the water surface so that the visibility of the pool or spa bottom is not obscured; and Walkway lighting yielding at least 15 footcandles of light.