LED Strip Lights: COB vs SMD
Voltage, Driver, Profiles & Cost (2026)

What an LED strip actually is

The Wikipedia entry on the LED strip light describes it as a flexible circuit board populated by surface-mount LEDs, usually with an adhesive backing. It is sold on reels, cut at marked points, and joined with clips or solder. On its own a strip is just the light source: a proper installation also needs a driver to power it, a profile or channel to hold it, and a way to switch and dim it.

Strips are used for the hidden glow in a plaster ceiling cove, the backlight on a TV wall, the light under kitchen wall cabinets and inside wardrobes, and the line under a stair handrail. The design side of cove ceilings is covered in the plaster ceiling design guide; this page is about choosing and installing the strip itself.

COB or SMD: dots or a continuous line

The two families you will be offered differ in how the LEDs sit on the board:

In a cove where the strip is hidden behind a lip and bounces off the ceiling, an ordinary SMD strip is fine. Where the strip itself is visible — under a glass shelf, around a mirror, along a handrail — a COB strip or an SMD strip in a deep opal diffuser gives the clean line people expect.

12 V or 24 V, and why long runs go dim

Wikipedia notes that LED strip lights most commonly operate on 12 or 24 volts of direct current from a power supply, sometimes referred to as a driver. It also explains the catch: most strips are a constant-voltage design that is sensitive to the voltage drop along long lengths fed from one end, so the far end glows dimmer or warmer than the start.

• For runs longer than a short shelf, a 24 V strip loses less along the way than a 12 V strip of the same power.
• Long coves are fed from both ends or from the middle, or split into sections, rather than one feed at one corner.
• Constant-current strips hold the same brightness along the length within a wider voltage range.
• Mains-voltage strips allow very long runs without a separate driver, but they are heavier and are an outdoor product.

The driver: size it, and keep it reachable

The driver converts the mains supply to the strip's voltage. Size it for the total wattage of the strip plus headroom, rather than running it at its limit in a hot ceiling void. Put it where it can breathe and where it can be replaced: above an access panel, in a cabinet, or next to a ceiling hatch. A driver sealed inside a closed plaster box is the most common reason a whole cove has to be cut open later.

The mains supply to the driver comes from a lighting circuit. That connection, and any new point for it, is fixed electrical work for a registered wireman; the electrician services guide explains what that person does. Everything after the driver is low voltage, but the joints still need proper connectors, not twisted wires and tape.

Aluminium profiles and diffusers

An aluminium profile is a channel the strip sticks into, usually with a clip-on opal or clear cover. It does three jobs: it draws heat away from the LEDs so they last longer, it gives the adhesive a clean metal surface that holds in Malaysian heat, and the cover hides the dots. Recessed profiles sit flush in a shelf, a skirting or a plaster ceiling; surface profiles screw on. For COB strips a profile is effectively required, because they run warmer.

Where strips work in a home

• Ceiling cove or L-box: the classic hidden glow; strip laid on the cove floor, facing the ceiling.
• TV and feature walls: a strip at the top grazes a textured or fluted wall; a strip behind a floating panel gives a halo.
• Kitchen and wardrobes: under wall cabinets for the worktop, and inside deep wardrobes, often on a door or motion sensor.
• Stairs: a line under the handrail or under each tread nosing; the staircase renovation guide lists a strip under the handrail at RM80 – RM150 per linear metre installed.
• Mirrors and vanities: a COB strip in a profile around or behind the mirror.

Bathrooms, balconies and outdoors: IP ratings

Bare strip has almost no protection against water. Wikipedia notes that uncoated tape may be rated IP20, while water-resistant strip is coated in silicone or epoxy and can be rated IP65, IP67, or with suitable sealed connections IP68. In a shower area, on a balcony or in a garden, use a coated strip with sealed end caps and joints, keep the driver dry and away from the wet zone, and protect the circuit with an RCD. The outdoor lighting guide explains IP ratings in more detail.

Switching, dimming and colour

A strip is switched on the mains side of the driver like any other light. To dim it, use a dimmable driver with a matching dimmer, or a low-voltage dimmer or controller between the driver and the strip; mixing a standard wall dimmer with a non-dimmable driver gives flicker and buzzing. Tunable-white and RGB strips need their own controller, often with a remote or app. Plan the switch position before the ceiling is closed.

Why LED strips fail early

• Adhesive letting go on dusty plaster or in a hot roof-space cove: stick to a clean profile, not raw board.
• No heat path: strips laid on timber or plaster without a profile run hot and dim over time.
• The far end dimmer or a different colour: voltage drop on a long single feed.
• Sections going dark: a cracked solder joint or a clip connector that has worked loose.
• Flicker or total failure: an overloaded, overheated or incompatible driver. The flickering lights guide covers flicker causes more widely.

What LED strip lighting costs

These are the published ClickBina indicative ranges for strip lighting and the work around it:

Figures are indicative 2026 Klang Valley ranges. Profiles, controllers, access panels and making good a ceiling are quoted with the job. The main cost drivers are the length, COB or SMD, the number of drivers and feeds, and whether the strip goes into a new ceiling or an existing one.

How ClickBina can help

WhatsApp us your job details for a quote: where the strip goes, the length, and whether the ceiling or cabinet is new or existing. ClickBina is an experienced KL & Selangor contractor for whole-house refurbishment and trade coordination, so the ceiling or carpentry, the driver access, the wiring and the paint are planned in one sequence. We reply within the hour, and the price agreed is a flat price with no hidden charges. A site visit is RM150, waived if you go ahead.

Sources & methodology

• Wikipedia: LED strip light — construction, 12 V / 24 V drivers, voltage drop, constant current, IP ratings.
• ClickBina home lighting design and plaster ceiling design guides — cove strip, cove box, wiring point and dimmer prices.
• ClickBina staircase renovation and walk-in wardrobe guides — handrail and wardrobe strip prices.

Methodology: prices are ClickBina indicative 2026 Klang Valley ranges from the guide named beside each; technical descriptions follow the cited Wikipedia entry.