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Just so you knowWhen you turn off a light switch. You do not shut off the power to the light. You break the circuit between power and ground (actually neutral but let's keep things simple). The danger is, even if you shut off the light switch, while you are playing with the broken light bulb you might become the ground for the circuit. The power is still going to the light but the circuit is not complete until either the switch is moved or you and your potato become a ground and both get cooked.Play safe, turn off the breaker at the panel.