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LED coving gives a room the kind of soft, architectural glow that used to need a plasterboard pelmet and an electrician's week. With modern XPS (extruded polystyrene) profiles, the whole job - coving and lighting - is a weekend project for one person. This guide covers planning, fitting and lighting, in that order. What is LED coving, exactly? LED coving is cornice moulding with a concealed channel behind its top edge. An LED strip sits inside the channel, out of sight; the light it throws washes across the ceiling, so you see the glow but never the source. Decovision profiles are cut from XPS (extruded polystyrene) - a dense, closed-cell foam around a tenth of the weight of plaster, with a smooth face that paints like plaster once fitted. Planning: three decisions before you order 1. Which walls carry the light? Most rooms look best with the LED line on two or four walls, not one. Measure the full run and add 10 percent for cuts. If you are unsure how many metres you need, send us your room sizes through the contact page and we will calculate it for you. 2. Where does the power come from? LED strip runs on a low-voltage driver that needs a socket or fused spur - usually above a cabinet, in a cupboard, or in the ceiling void. Plan the driver position before fitting the coving, so the feed cable can hide behind the profile. 3. Which profile? Deeper profiles throw a wider wash of light; slim profiles like our DV-LO lighting coving keep things minimal. Order a 20 cm sample first - every Decovision LED series has one from £1.95 - and hold it against your ceiling before committing. Fitting the coving: step by step Check the package. Lengths are numbered so you can confirm the pack is complete. The foam fillers inside are packaging, not product. Corners first. Ready-made internal and external corner sets are cut at 45 degrees and fit before the straight lengths - the cleanest route. Cutting your own? Use a mitre box. Fix with solvent-free adhesive only. Solvent-based adhesives attack polystyrene. Surfaces must be clean and dry; apply adhesive to the contact faces, press firmly, wipe the excess with a damp cloth. Fill and paint. Seal the joints with acrylic filler, sand lightly when dry, then two coats of water-based paint. Paint before the LED strip goes in - it is far easier. Critical rules Never use solvent-based adhesive or paint on XPS (extruded polystyrene). Keep the LED driver accessible - never seal it behind the coving. Fit the strip to the channel, not loose - adhesive-backed strip pressed onto a clean, dust-free surface. Aluminium foil tape in the channel improves heat dissipation and reflectivity - we stock it. Mains wiring is an electrician's job. Low-voltage strip and plug-in drivers are DIY-safe. Choosing the LED strip Strips are not included with the coving, which is deliberate: colour temperature is personal. As a rule of thumb, 2700-3000K reads warm and cosy for living rooms and bedrooms; 4000K suits kitchens and workspaces. Pick a strip with at least 120 LEDs per metre for an even line of light without visible dots, and a CRI of 90 or higher if colours matter in the room. Frequently asked questions Can one person really fit LED coving alone? Yes. A 2 m length of XPS (extruded polystyrene) coving weighs a fraction of its plaster equivalent - you can hold it overhead one-handed while the adhesive grabs. Do I need to chase cables into the wall? No. The feed cable hides behind the coving itself; only the driver needs a socket. Will the coving crack like plaster? No. XPS (extruded polystyrene) flexes with normal building movement instead of cracking along the joint line - a real advantage in older UK homes. Can I fit LED coving in a bathroom? Yes - the closed-cell material is moisture-resistant. Use an IP-rated strip appropriate to the zone. What if I am not sure which profile suits my room? Order samples of two or three profiles. At £1.95 each it is the cheapest design decision you will make. Start with a sample Browse the LED coving collection - nine profile families, every one with a hidden light channel and a 20 cm sample. See it, feel it, hold it against your ceiling; then order the room.