Review on 🐠 HiTauing 14W LED Aquarium Light Full Spectrum 12-18 inch Fish Tank Light, Aluminum Alloy Shell, Extendable Brackets, Sunrise-Daylight-Moonlight Mode, DIY Mode, Adjustable Timer, Brightness - Enhanced SEO by Katrina Davis

Simplified Guide - You can only set the day and night timer in the morning. First, it will work in daylight mode for 3.6 or 12 hours, that is, in the morning at sunrise. Press and hold the power and day buttons at the same time to change the brightness when a timer is running. Do the same for night mode. Once they're set, press the Day button until you see the daylights flashing at the hours you want, then press Night Mode until you see the time is set for the hours you want, and then you're done finished . Pretty basic, just a pain. I don't think it's waterproof in any way. The plastic covering the LEDs is not airtight and will move. You can seal it then it is waterproof not waterproof. The brightest setting scared my fish to death.