Nordlux's lamp needs one bulb. This lamp is first and foremost intended for indoor use and you should not use bulbs with more than 9W.
From Lampemesteren
Nordlux - Fallon Spot White/Brushed Steel
Conrad Electronic
Nordlux Fallon LED surface-mount light LED (monochrome) Built-in LED 5.5 W Warm white White, Stainless steel (brushed)