hygger Auto On Off LED Aquarium Light Extendable 12-55 Inches Dimmable 7 Colors Full Spectrum Light Fixture for Freshwater Planted Tank Build in Timer Sunrise SunsetHygger 957 Planted Aquarium Light features programmable, gradual 24 hour light cycle settings (sunrise, midday, sunset and night), auto on and off, to create a optimal condition for your fish and aquatic plants Build in Timer The lighting system enables a variety of features such as customizing the intensity and colors of the light, setting up daytime to nighttime schedules, mimics sunrise and sunset, color gradient loop, fine tune lighting schedule,