Underwater lights are a must for nighttime pool safety and enjoyment. But their usefulness doesn't end with simply illuminating darkened pools. Standard pool lights from Pentair can also enhance your pool or spa's beauty and help create an inviting backyard environment after the sun goes down. Long the standard for reliable pool and spa illumination, standard incandescent and halogen quartz pool lights from Pentair are available in both 120-volt and 12-volt models.