1. Unplug the light bulb. After unplugging the power plug, remove the waterproof cover behind the light bulb. Take the bulb out of the reflector. Light bulbs are generally fixed with steel wire snap rings, and light bulbs also have plastic bases. 2. Put the new light bulb into the reflector, aim at the fixed position of the light bulb, hold the steel wire snap rings on both sides and push inward to fix the new light bulb in the reflector. 3. Cover the waterproof cover again, plug in the bulb power supply, and complete the fixing operation.