NICREW ClassicLED Gen 2 Aquarium Light, 15 Watts, Dimmable LED Fish Tank Light with 2-Channel Control, White and Blue LEDs, Size 18 to 24 Inch

Super bright 6500K White LEDs with optimized spectrum 460nm Blue LEDs for healthy growth of plants
More LEDs offer a higher level of luminous efficiency and brightness, 50% brighter than before
Adjustment can be made for both brightness and color temperature. Very easy to lower the blue lights for a more warm look, or use high blues and low whites for a cool even look
Build in 8/10/12H Timer and 15 minute ramp up / dim down. Set it, and forget it. The gradual lighting increase when turning on and the gradual lighting decrease when turning off does lend a feeling of being more in nature, avoiding startling your fish
Ideal for freshwater or saltwater fish-only and low-high light level aquarium plants, for aquariums 18 – 24 inches (Light length without bracket is 16.1 inches)