The big chandelier at home is not turned on in lightning weather (the switch is off), but it will be bigger when the lightning is heavy.

Is your chandelier an energy-saving lamp? Energy-saving lamps and fluorescent lamps both emit light by themselves under strong electric fields. Energy-saving lamps and fluorescent lamps themselves react with argon and mercury vapor inside through the high-voltage emission of electron flow to generate ultraviolet rays to irradiate the fluorescent powder on the surface to generate visible light. The electric potential energy generated by lightning is very close, which may make the gas molecules inside the lamp have similar electrification reaction, so it will light up.