Resetting a Smart Bulb readies it to pair to a Gateway in “Pairing” mode. Here are reset instructions by brand:
To pair a GE Smart Bulb again or pair it with a different Gateway, power the light on and off five times in a row at three-second intervals.
Lightify bulbs follow the same procedure as GE.
Cree bulbs follow the same procedure as GE but need only four cycles.
If necessary, repeat the procedure.
Note: Philips Hue bulbs can only support a one-time pairing. They cannot be reset.