Installing an LED strip in a room for ambient lighting
An LED strip turns an ordinary room into a warm space, with precise, directional and very economical ambient lighting. It sticks anywhere: under a kitchen cabinet, along a skirting board, behind a screen or under a shelf. This guide is for those who want to equip a room without embarking on major electrical work: the connection is limited to a socket and a transformer.
Choosing your LED strip: intensity and colour temperature
Intensity is expressed in lumens: allow about 300 to 500 lumens per metre for ambient lighting under a cabinet, and up to 1,000 lm/m for task lighting. The colour temperature is chosen in kelvins: 2,700 to 3,000 K gives a warm, soft light, ideal in the living room or bedroom; 4,000 K, neutral, suits the kitchen; 6,500 K, cool, is reserved for work areas. For a stuck-down strip, prefer the 60 LEDs per metre model in 12 V or 24 V, which offers a uniform finish without visible bright spots.
- Measure the exact length to light with a tape measure and cut the strip only at the cut marks, usually every 5 cm at the copper pads, never anywhere else.
- Degrease the support with a cloth soaked in methylated spirits, let it dry, then peel off the protective film from the adhesive.
- Stick the strip progressively pressing firmly without pulling on it, turning cleanly in the corners with 90° connectors.
- Connect the connector to the strip respecting the polarities (+ and -) and link it to the 12 V or 24 V power supply suited to the total wattage.
- Plug the transformer into an earthed socket, then test each section by switching the light on.
Where to stick the strip for a successful result
Under a skirting board, the strip creates an elegant grazing light; under kitchen cabinets, it lights the worktop without shadows; at the ceiling behind a coving, it diffuses indirect light that visually enlarges the room. The golden rule: the strip is always placed where you cannot see the LEDs directly, for a soft, glare-free effect. Also think of letting the strip run continuously: do not cut it too short to save a few centimetres.
Adding a dimmer or a connected strip
If you want to adjust the intensity, place a compatible dimmer between the transformer and the strip: not all models support it, check the mention on the packaging. Connected strips are controlled from your phone via a Wi-Fi or Bluetooth bridge, with timers and colour scenes. Whichever option, keep the transformer accessible so it can be replaced easily.
Precautions and mistakes to avoid
- Cutting the strip outside the cut marks: one or more sections will no longer light up and the strip may be unrecoverable.
- Reversing the polarities at the connector: the strip does not light up, or even damages the power supply.
- Using an undersized or unprotected power supply, risking overheating and fire.
- Sticking the strip on a dusty or damp surface: it peels off within a few weeks.
- Extending the strip beyond the maximum series length stated by the manufacturer, often 5 m.
In one hour, your room gains a modular and very economical ambient lighting: one metre of LED strip consumes about 14 W, like a low-energy bulb. Choose your colour temperature according to the use, measure twice before cutting, and everything goes smoothly. All that remains is to enjoy the effect.