Smart LED bulb Yeelight E27 W4, dimmable, 9W, 806 lm, 2700–6500K, Wi‑Fi (2.4 GHz), E27 socket, white

Yeelight E27 W4 is a smart LED bulb that fits standard E27 sockets and delivers 806 lm of adjustable white light. The lamp provides a tunable colour temperature range from 2700 K (warm white) to 6500 K (cool white), supports Wi‑Fi (2.4 GHz) and Bluetooth connectivity, and is compatible with Amazon Alexa, Google Assistant and Apple HomeKit. Rated power is 9 W and the bulb operates in ambient temperatures from −10 to 40 °C.

Advantages

The bulb offers energy‑efficient LED illumination with dimmable white light and wide colour‑temperature adjustability for different moods and tasks. Wireless control via Wi‑Fi (2.4 GHz) or Bluetooth enables remote switching, scheduling and integration with smart home assistants. The compact design suits standard fixtures while delivering a high luminous flux of 806 lm at 9 W.

Suitable for

• Living rooms and bedrooms where adjustable white light is needed
• Desks or reading areas requiring focused, dimmable illumination
• Smart home setups using Amazon Alexa, Google Assistant or Apple HomeKit
• Rooms with standard E27 light fittings

Key specifications

• Light output: 806 lumens
• Rated power: 9 W
• Colour temperature: 2700–6500 K (adjustable white)
• Interface: Wi‑Fi (2.4 GHz) and Bluetooth
• Socket type: E27
• Bulb type: LED
• Operating temperature range: −10 to 40 °C
• Light colour: white, dimmable
• Dimensions: height 110 mm, diameter 60 mm

How to use

Screw the Yeelight E27 W4 into a compatible E27 socket and power the fixture. Connect the bulb to your 2.4 GHz Wi‑Fi network or pair via Bluetooth following the Yeelight app instructions. Use the app or a connected voice assistant (Amazon Alexa, Google Assistant, Apple HomeKit) to adjust brightness, set schedules and change colour temperature. Allow the bulb to cool before touching after use.

Recommendations

Avoid touching the bulb immediately after switching off, as the product may become hot during use. For stable wireless control, ensure the bulb is within range of a 2.4 GHz Wi‑Fi network and follow the manufacturer's app setup steps.