NICREW ClassicLED Aquarium Light, Fish Tank Light with Extendable Brackets, White and Blue LEDs Super bright, energy efficient and long lasting LEDs to produce amazing shimmer to your aquarium Adjustable metal brackets to fit aquarium tank from 12 inches to 18 inches. Fits for fish tank thickness not more than 1/2 inch(12 mm) Light Fixture: 12 in L x 4 in W, Hood w/ Brackets Extend: 18 in L x 4 in W Two lighting modes: White & Blue LEDs for daylight and Blue LEDs for nightlight One-Year Limited Warranty. Please use over a glass or acrylic canopy