LED aquarium lighting with an Arduino based PWM timer -
Arduino Aquarium Controller - Hackster.io
Arduino Aquarium Auto Lighting System (custom PCB) - YouTube
DIY Arduino LED/Reef Controller-Update - YouTube
Arduinotyphonwiringdiagram02-2013_zps785 | Led controller, Led, Arduino
GitHub - mathompl/AquaLed: Arduino Dimmable PWM DIY LED Light for Marine/Reef/Freshwater Aquarium controller with Nextion LCD support and temperature/cooling fans control (3 sensors/fans)