This LED fixture features 21 LED bulbs 18 bulbs are daylight and 3 are stationed in the middle for moonlight lunar effects. Given the option, you have full control over having all LEDS powered on at once or having only the moonlight LEDS powering your tank for a beautiful night effect. This unique fixture has a silver top finish giving your aquarium a cleaned advanced look. The solid yet flexible neck gives you easy access in and out of your aquarium without having to remove the fixture from the aquarium. The ON/OFF controller switch also features a water resistant covering to help prevent from moisture mishaps. LED aquarium lighting has been commonly used for night time lighting but has recently gained traction as being the main light source. LED lunar lights gives you a window into what your nocturnal pets do at night. Using LED lighting as the main light source also has many benefits. LED bulbs are extremely energy efficient, last up to 5 years (50,000 hours) and have little to no heat output. Specifications Total Output: 2 Watts Total LED Bulbs: 21 LED Gap Rim Allowance: 10mm AV100V 50 Hz/60 Hz.