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Sensors

Detection and control sensors from Knightsbridge, built to switch lighting on movement, daylight or time of day. The range covers PIR motion sensors with 180 and 360 degree coverage, mmWave occupancy sensors, photocell dusk-to-dawn switches and smart Wi-Fi PIR and contact sensors with app alerts. IP ratings run from indoor IP20 up to weatherproof IP65 and IP66, with mains-powered and battery models for halls, bathrooms, gardens and commercial spaces.

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What these sensors do

Detection and control sensors switch lighting and signal activity based on movement, daylight or the time of day. Rather than relying on a manual switch, they let lights respond on their own: coming on when someone enters, holding off in daylight, or following a dusk-to-dawn pattern. The range covers the main sensing methods used around a home or commercial space.

The types in this range

Motion sensors detect movement, with a coverage angle suited to mounting on a wall or a ceiling. Occupancy sensors using mmWave detection pick up presence within a space, which helps where small movements should still keep a light on. Photocell switches respond to daylight for dusk-to-dawn control, holding lights off while it is light and bringing them on as it darkens. Smart Wi-Fi sensors add app alerts, including a contact sensor for doors and windows, and microwave sensor modules are included for building movement detection into a fitting.

Where they fit

IP ratings run from indoor models through to weatherproof versions for outdoor and exposed positions, so there is a sensor for halls, bathrooms, gardens and commercial spaces alike. Both mains-powered and battery options are available, which widens where they can go, since a battery model can sit where there is no convenient supply. Finishes such as black and white help them suit the surface they mount to, whether that is a wall, a ceiling or a fitting.

How to choose

Start with what should trigger the lighting: movement, daylight or a set pattern. Pick a motion sensor and its coverage angle for a wall or ceiling, a photocell for daylight switching, or an occupancy sensor where presence detection suits the space. Check the IP rating against where it will be fitted, indoor or outdoor, and choose mains or battery and a finish to match. Free UK delivery over GBP 99, worldwide shipping.

Frequently Asked Questions

What is the difference between PIR and mmWave sensors?
PIR sensors react to the heat of a moving body and suit doorways, hallways and gardens. The mmWave occupancy sensors use microwave detection to pick up finer movement, so they hold lights on while you sit still in a room. The range carries both, in surface, recess and ceiling-mount formats.

Which sensors can I use outdoors?
Look at the IP rating. Indoor-only units are IP20, while outdoor-rated models run IP44, IP55, IP65 and IP66 against dust and water. Weatherproof PIR sensors and dusk-to-dawn photocell switches in this range carry the higher ratings for garden walls, porches and commercial entrances.

How much load can a sensor switch?
Capacity varies by model. Some microwave sensor modules in this range are rated up to a 1000W maximum, and outdoor microwave units up to 400W of LED. Check the figure on the listing against the total wattage of the fittings you want to control, and stay within it.

Do any sensors work with a phone app?
Yes. The smart options are Wi-Fi PIR motion sensors and a Wi-Fi door and window contact sensor, both giving app control and battery alerts. The non-smart mains sensors simply switch the connected light and need no hub or account.

Do I need an electrician to fit one?
Battery-powered smart sensors mount with no wiring. Mains-powered PIR, microwave and photocell units connect into a lighting circuit, so isolate the supply first and have fixed wiring carried out by a qualified electrician. Mounting height and angle matter, so follow the detection range stated for each model.

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