This is a lamp from Konstsmide which uses one bulb. This lamp is meant to be used outdoors and the bulbs should be no stronger than 100W.
From Wayfair
1 Light Outdoor Wall Lantern
Zoro
Netlighting Pallas Outdoor Classic Lantern Flush Wall Light - Matt White, IP23
Illumination.co.uk
Konstsmide Pallas wall light white, 1-light source