With 70 lights, you’ll get four to five hours of ugly sweater glamour out of a fresh 9-volt battery. Solder the battery pack cable to the battery and ground spots on the Arduino.

Building a portable lamp with a 9V battery and LED bulb is a simple, creative DIY project that anyone can try. This video provides clear, step-by-step instructions for assembling a functional lamp ...

pureLiFi, technology company Yet what if you could get a stronger, faster, more secure connection from an ordinary light-emitting diode light bulb?