Attach NodeMCU on Breadboard.
Connect VCC of Relay with Pin 3.3V of NodeMCU.
Connect GND of Relay with GND of NodeMCU.
Connect Pin Signal of Relay with Pin D7 (GPIO 13) of NodeMCU.
Connect one terminal of Bulb (Blue Wire) with Pin NC (Normally Close) of Relay.
Connect one terminal of Adapter with Pin C (Common) of Relay.
Connect the other terminal of Bulb (Red Wire) with another terminal of Adapter.