Brightness Adjustable: 5 levels of brightness in total from 100% to 20% according to your preference

Built-in Timer: Three timing modes available at 4, 8, or 10 hours; light will automatically turn off and on at the time you set

3 Groups of LED Lights: Each group can be turned on and off separately - Group 1: All lights (White + Pink + Green + Blue) on for cool light effect; Group 2: All lights except blue lights (White + Pink + Green) on for warm light effect; Group 3: 6 blue lights on for night mode

Adjustable Mounting Brackets: Fits aquarium tank from 16 inches to 20 inches in length with adjustable mounting brackets; Light body without docking brackets measures 14 inches L x 2.7 inches W with no limit to rim size

Super Bright and Energy Efficient LEDs: Total 30 LEDs including 20 pcs 6500K white, 6 pcs blue, 2 pcs pink, 2 pcs green, suitable for all freshwater and low to medium light plants; NOTE: KEEP THE LIGHT AWAY FROM SPLASHING WATER

Full Spectrum Lighting: Provides 1800 lumens with 5730 LED technology for optimal plant growth and fish color enhancement in freshwater aquariums

Easy Installation: Extendable brackets measuring 5.9 inches each allow for simple setup and secure mounting on various tank rim sizes