If you’re planning to leave the lamp on for extended periods of time, it’s best if you power the circuit via 5V USB power supply. You can use your computer’s USB port, USB hub or dedicated 5V power supply. The only difference in the wiring is to connect 5V PWR+ pin from the NeoPixel ring to the USB pin on the Adafruit Feather 32u4 Bluefruit LE.