Measure the TV’s back, not just the screen. Note the width and height of the panel where the strip will sit, then decide whether you want light along three sides or all four. A flexible tape measure helps around rounded corners. Write down each side separately.

Keep the layout practical. A three-sided strip often leaves the bottom clear for stands, cables, and ports. For a full perimeter, add the top, bottom, and both sides, then allow a little extra for the path to the power source. Check the strip’s cutting marks before buying; many strips can only be cut at marked points. Don’t stretch one to fit. Short is frustrating.

Before sticking anything down, lay the strip loosely behind the TV and check the corners. Some strips tolerate gentle curves but crease under tight bends. Leave room for the power lead, and avoid covering vents or connection panels. Clean the mounting surface and let it dry fully. I’ve found that measuring twice still doesn’t prevent every awkward corner, so test the route before removing the adhesive backing.

Before mounting LED strip lights behind a TV, size the power supply from the strip’s rated voltage and power consumption. Use the industry formula:

For example, a 5-metre strip rated at 14.4 watts per metre needs 72 watts total. At 12 volts, that load draws 6 amps. Add about 20 percent capacity as practical headroom, giving a supply rated for roughly 86 watts or more. This margin is a rule of thumb, not a substitute for the strip maker’s specifications. Check the label carefully.

Before peeling the adhesive backing, measure the TV’s rear perimeter and plan where the strip will start. Keep it a consistent distance from the outer edge, leaving vents, screw holes, and connection ports clear. A paper tape measure or masking tape can help you mark the route. Check the layout from behind the screen.

Clean the mounting surface with a soft, dry cloth, then let it dry fully. Turn off and unplug the strip before cutting. Cut only at the marked cut lines; cutting between them can damage the circuit. Corners need care. Avoid sharply folding the strip, since that can lift the adhesive or strain its contacts. Use a connector if the bend is too tight.

Peel away a little backing at a time and press the strip gently along your guide marks. Check the spacing every few inches, especially near corners, where small errors can become obvious. Don’t pull the strip taut. That’s easy to do. If one section looks uneven, lift it carefully before pressing it firmly; repeated repositioning may weaken the adhesive. Leave a small gap from the TV’s edge so the light does not show directly when viewed from the room. After mounting, reconnect power and test the LEDs before moving the TV back against the wall. A slight offset may still be visible in a dark room, so adjust the position before the adhesive fully sets.

A bias light should support the picture, not compete with it. Set the light falling on the wall behind the television to about 10% of the display’s peak-white luminance. ITU-R BT.2035-0 describes a controlled HDTV viewing environment with a subdued surround, while SMPTE RP 166-1995 gives guidance for critical picture evaluation. These standards help explain why a dim, neutral background can make viewing more comfortable. Keep the light neutral white, and avoid visible dots or reflections around the screen.

For example, if measured peak white is 200 cd/m², aim for roughly 20 cd/m² on the illuminated wall. That figure describes wall luminance, not the LED strip’s advertised power or brightness setting. A luminance meter gives the clearest reading; phone sensors are only rough checks. No meter? Start low, then compare a bright scene and a dark scene in your usual room. The wall should look gently lifted, not glowing. I still recheck after changing picture modes, because peak brightness can shift. A little too dim is usually easier to live with than a distracting halo.