12WATT + 24LEDS---Super bright, energy efficient and long lasting LEDs to promote growth of aquarium plants and fishes. TELESCOPIC BRACKETS---Adjustable metal brackets to fit tank length from 15 inches to 23 inches.Suitable for glass less than 3 inch thickness. ENERGY-SAVING---Low voltage, super safe LEDs making them super safe for fish tank plants and fishes. LONG SERVING LIFE---Ultra-thin aluminium alloy shell ensures excellent heat dissipation. EASY TO INSTALL---Removable mounting legs allow for flexibility in tightly fitting aquarium.