See the source page below for full instructions including a wiring diagram and step-by-step photos. Automatica Lights for Desk Interior | Make Projects via Hack-A-Day ...

This automatic park light switch with LDR automatically turn ON the light when the surrounding light dims to a preset level. The first circuit diagram is an NPN design intended for negative grounded ...

This colorful back led aquarium lights gives natural appearance to the Aquarium tank. The Aquarium Led Lighting circuit automatically turns on at sunset and gives changing White, Blue and Green color ...