How bright is the SolarLED 360 compared with a mains floodlight?

Solar security lights of this type are typically dimmer than wired floodlights. Expect enough light to mark a path or scare off intruders, not stadium-level brightness.

Does it work in winter or on cloudy days?

It charges less on short, gray days, so runtime and brightness drop. Place the panel where it gets direct sun and expect weaker performance through a cloudy stretch.

Do I need to wire it to my house?

No. The panel charges a built-in battery and the LEDs run from that, so there is no mains connection. Mount it where the panel sees sun.

Is it motion-activated?

The description covers 360-degree lighting but does not specify a motion sensor. Check the listing for a PIR sensor if automatic switching matters to you.

Where should I mount it?

High enough to cover the area and with the panel facing the sun most of the day. A shed corner, garage wall or post works better than a shaded doorway.