電でん灯とうをつける

Meanings

1

expression, ichidan verb

turn on a light; switch on a light

A common phrase for turning on an electric light; 電灯 refers specifically to electric lights.

電でん灯とうを点つける

Alternate spelling using 点ける for 'to light/turn on'; less common than kana つける.

電でん気きをつける
More general; 電気 can mean electricity or light, while 電灯 specifically means an electric lamp.
明あかりをつける
Refers to turning on any light source, not necessarily electric.

Compound of 電灯 (electric light) + を + つける (to turn on).