Sonoff B05-BL-A60 smart Wi-Fi RGBCW LED bulb E27 9 W 806 lm

The thread or pin type that fits the bulb into the fitting; it must match the socket. E27 is the standard large screw, E14 the small screw, GU10 a twist-lock 230 V spot, GU5.3 (MR16) a pin spot usually running on 12 V.

What light the bulb or strip can produce. “Tunable white” gives only shades of white from warm to cool. “RGB colour only” mixes red, green and blue, so white looks less natural. The “colour and white” options add separate white LEDs to the colours: one fixed shade (RGBW) or tunable (RGBCW).

How much light the fixture or bulb gives at full brightness, in lumens. As a guide, about 800 lm is roughly what a 60 W incandescent bulb gave. A room is usually lit by several sources, and their flux adds up.

The range of white shades in kelvin: 2700 K is warm like an incandescent bulb, 4000 K neutral, 5700 K and above cool, close to daylight. If the shade is fixed, both values are the same.

The bulb's shape. It decides whether the bulb fits the shade and how it looks in an open fitting. The maker's exact designation (e.g. A60 — a 60 mm pear, ST64 — an elongated 64 mm bulb) is given in the note.

The LEDs are thin filaments under clear or tinted glass, so the bulb looks like a vintage incandescent and is often used in open fittings without a shade. Ordinary LED bulbs have frosted glass and give more diffused light.

How natural the colours of objects look under this light, on a scale up to 100 (100 is like sunlight). Ra 80 is the usual level for living rooms; from 90 up, skin, food and fabrics look noticeably more natural.

Hours of use the maker states before brightness drops noticeably or the bulb fails. 15,000 h is roughly 10 years at 4 hours a day. It is an estimate, not a guarantee.

The wireless link or network the device uses. Wi-Fi connects straight to the router; Zigbee, Thread and Bluetooth Mesh work through a hub or gateway.

Whether the device needs a separate hub, gateway or coordinator to work in a smart home. If so, it is sold separately unless stated otherwise.

Whether the device supports the Matter standard, directly or through a bridge. Matter lets you add it to Apple Home, Google Home, Alexa and Home Assistant.

How the device connects to Home Assistant: a built-in integration, a Zigbee coordinator, Matter or the maker’s cloud integration.

Whether the device keeps working over the local network or through a hub when the internet is down. Cloud features (remote access, voice assistants) need the internet.

Which voice assistants the module works with, per the maker. Commands like 'turn on the air conditioner' go through the cloud, so internet access is needed.

The maker’s app used to set up and control the device.

The Bluetooth version used for the remote, wireless headphones, speakers and gamepads. Newer versions hold the connection more steadily and use less power on connected devices.

Where the device gets its power: 230 V mains, an adapter, USB, batteries or a built-in battery.

The supply voltage (and current, if stated) as the maker gives it. It must match your mains or adapter.

The rated or maximum power draw from the spec sheet. It sets the load on the socket and the energy use.

Whether the light can change colour and brightness to the beat of music. A built-in microphone listens to the room by itself; in “via phone microphone” mode the smartphone with the app open must hear the music.

The device’s size in millimetres as the maker states it. Check that it fits the wall box, niche or shelf.

Standards and certifications the maker lists for this model (for example CE, RoHS, Zigbee 3.0, Matter).

What comes in the box, per the maker.