Philips Hue's ceiling lamp requires one bulb. This ceiling flush light should be used indoors and recommended wattage for bulbs is maximum 5W.
From Amazon
Philips Hue Adore White Ambiance LED Recessed SpotLight [Silver - Round] For Bathroom lighting With Bluetooth, Compatible with Alexa, Google Assistant and Apple HomeKit
Philips Hue
Adore bathroom recessed downlight
Conrad Electronic
Philips Lighting Hue LED bathroom ceiling light 871951434079400 Adore GU10 5 W Warm white to cool white