hygger 957 plant lighting system 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. Integrated timer offers daylight, moonlight and DIY setting.The white daylight mode actually blends the white, green, red and blue LEDs together. The preset of moonlight is blue light. You can change the lighting mode into other color. 6 single-colors ((red, blue, green, purple, cyan, yellow) and 10 level intensity options. Programmable sunrise and sunset functions enable the LEDs to be easily programmed to slowly turn on or off in 15-minute which prevents light shock to your fish and other aquatic life. The light can be set to turn on and off at the designated time. The preset daylight lights on at 6:30 am and turn off at 6:30 pm while nighttime turns on 6 pm and turns off at 11:30 pm. You can change the preset time by follow instruction manual. It also comes with a programmable preset that can save customized color combinations and lighting intensities. Just set time, place the light on top of your aquarium, adjust mounting legs, then you can enjoy the beauty of your fish and aquatic plants. DIY setting mode is designed for planted tank which is white light blending the white, green, red and blue LEDs together. It can only adjust the brightness level from 10-100. Or choose 00 for darkness. 1.2 mm thickness fully encased aluminum shell and IP68 water-resistant rating provides more effective heat transfer and protects the device from humidity and water intrusion. No need to worry about splashes, or other accidental drops of water. Extendable metal mounting legs fit aquarium widths of 12-18 inches, 18-24 inches, 24-30 inches, 30-36 inches, 36-42 inches, and 48-55 inches. DC powered adapter is safe to use, energy saving and extend light life. This 957 light is specially-designed for planted tank and freshwater fish aquariums.