My Light flashes Red, Green, Blue, White & then Purple every time I cycle the power

Your bulb is stuck in Factory Test Mode

LIFX Gen 3

To exit Factory test mode:

1. Ensure that the bulb is on at the switch
2. Turn the bulb on/off 5 times
3. The bulb should then cycle through the colors Red, Green, Blue, White, off, then White

Your LIFX should now show as a network and be ready to be setup again.

Color 1000

To exit Factory test mode:

1. Ensure that the bulb is on at the switch
2. Power cycle the bulb 3 times (off, on, off, on, off, on)
3. The bulb may strobe red, then turn white
4. Wait at least 10 seconds, then power cycle the bulb 5 times to reset (off, on, off, on, off, on, off, on, off, on)

Your LIFX should now show a LIFX network, to setup and operate correctly.

LIFX Original

To exit Factory test mode:

1. Ensure that the bulb is on at the switch
2. Power cycle the bulb
3. Flick the reset switch three times (ie, up, down, up or down, up, down) within 5 seconds
4. The bulb may strobe red, then cycle through Red, Green, Blue (quickly), and then appear to be off.
5. Power off the bulb.
6. Flick the reset switch to the opposite position.
7. Power on the bulb. 

Your LIFX should now operate correctly.