Look from below as well as in front
An LED strip hidden while you stand can become fully visible when you sit. Before fixing anything, look at the bookcase from the sofa and from the doorway. The underside of a shelf may be directly in view. A lighting position that seems concealed at eye level can therefore create a distracting bright line across the room.
Think about the object you want to illuminate. A light placed behind a row of books mainly brightens the wall and the backs of the books. A position nearer the front can send light onto the spines and objects below. The appropriate location depends on the shelf depth and the shape of the lighting product, so make a small trial before committing to the full run.
Use a complete product intended for furniture lighting and follow its installation requirements. A compatible channel or diffuser can change the view of individual LEDs, but it must be designed for the selected system. Do not cover a strip with improvised paper, fabric or other material to soften its appearance.
Plan one shelf first
Choose a representative shelf rather than the easiest empty one. Put the books and objects back before testing the light. Tall items can block the beam and glossy ceramics may create bright reflections. The arrangement might need a little more space around a few objects, not an additional strip on every edge.
Judge the effect with the room's ordinary lamps on. A shelf that seems subtle in daylight can dominate the sitting area after dark. If the lighting system offers compatible dimming, consider whether that would let it support the room rather than becoming its brightest feature.
It is reasonable to light only part of a bookcase. One display shelf can have a purpose while adjacent storage shelves remain quieter. Lighting every compartment equally can flatten the arrangement and expose things you would rather keep visually in the background.
Buy the connected parts as a system
Low-voltage lighting still requires the correct supply and compatible connections. IKEA's cabinet-lighting guidance, for example, treats the lights, driver, power cord and controls as separate components that must work together. Follow the specifications of your chosen range for total load, number of lights and permitted connections.
Do not assume all strips can be cut, extended or joined. Those options belong to particular products and marked locations. If the required length falls between available sizes, choose another supported arrangement rather than cutting an unapproved product to fit.
Make space for the driver or power supply before ordering. It needs the access, ventilation and placement specified by its manufacturer. Hiding it beneath a pile of books to keep the shelf neat is not a design solution. You also need to reach the plug and control without dismantling the bookcase.
Make cable routes part of the drawing
Sketch the route between shelves and the socket. Include the depth behind the furniture, door hinges where fitted, and the place where the supply lead enters the unit. A cable that is nearly long enough can pull at a connector once the furniture returns to the wall.
Use only the fixing method and cable-management accessories suitable for the product and furniture. Do not drill casually through a unit that may contain fittings, wiring or structural parts. Where the plan needs new fixed electrical work, involve a qualified electrician rather than extending the decorating task into a wiring project.
Furniture must remain assembled and restrained as its maker requires. A lighting installation is not a reason to remove a wall restraint or place the bookcase on an unstable support to gain access. In a rented home, establish permission for any required alterations before buying the system.
Leave yourself a way to maintain it
Dust will still need removing and books will still move. Keep the lighting away from places where pulling out a large volume will catch a cable or strike an exposed fitting. Leave enough access to replace permitted components without taking down the entire display.
Photograph the final component labels and save the instructions. If a control, connector or power supply later needs replacing, the exact system details matter more than the general description LED shelf light. A carefully planned single shelf is a better starting point than an ambitious whole-wall installation whose components and cables never quite fit together.
