The Hue bulb connects to your phone via Bluetooth or added to your smart lighting system using the Philips Hue Bridge (sold separately). Hue's White Ambiance bulbs allow precise control over brightness and colour temperature via the Hue App. Fully dimmable via the app and as bright as a 60W incandescent globe. Colour temperature is adjustable from 2000K (very warm white) to 6500K (cool daylight). Link up to 10 bulbs via Bluetooth or add a Hue Bridge to build a bigger system that can be controlled anywhere. Get complete colour temperature and light level control with these Philips Hue White Ambiance B22 globes. Specifications - Philips Hue B22 Smart Light Bulb White Ambiance Power Consumption 8.5W (0.2W standby power) Equivalent Wattage 60W Light Output 806 lumens @ 4000K Fitting Type Bayonet Cap B22 Shape A60 Voltage 220-240 V Lifetime 25,000 hours Colour Temperature Control Adjustable from 2000K (very warm white) to 6500K (cool daylight). Dimmable Yes, deeply dimmable using Philips Hue App. Colour Control No - see B22 Hue White & Colour Colour rendering index (CRI) 80 Connection Bluetooth (directly to smartphone or tablet) and Zigbee Mesh (via optional Hue Bridge). Further Documentation Brochure and Datasheet (PDF) Got questions about Philips Hue?