COB LED Strip Wattage Per Meter, Explained

You can pick the prettiest COB LED strip on the product page and still end up disappointed if the wattage per meter is wrong for the space. Too low, and your cove lighting looks like a soft night light. Too high, and you are suddenly dealing with heat, shorter driver life, or dimming issues that show up only after the carpenter closes the cove.

Wattage per meter is the spec that ties everything together - brightness, driver sizing, wire gauge, voltage drop, and even whether your strip stays consistent from the first meter to the last. If you are planning lighting for a renovation (especially common cove details in HDB-style layouts), this is the number that helps you get it right the first time.

COB LED strip wattage per meter guide: what it really means

Wattage per meter (W/m) is how much electrical power the strip consumes for every meter when run at its rated voltage (typically 24V for interior COB strips). More watts per meter usually means more light output, but it is not a perfect one-to-one relationship because LED efficiency, phosphor mix, and optical design vary by product.

COB strips (chip-on-board) look “smooth” because the LEDs are packed densely and covered by a continuous phosphor layer, so you get a clean line of light without dotting. That smoothness is the reason many homeowners choose COB for coves and cabinets. But because COB is visually continuous, the eye also notices uneven brightness faster. That is why matching wattage per meter with the right driver and run length matters more than people expect.

A quick reality check: wattage per meter is not a quality rating. A high-W/m strip can still have poor color, poor consistency, or flicker if paired with the wrong driver. And a lower-W/m strip can look premium if it is high CRI, well regulated, and installed thoughtfully.

How to translate W/m into “Will this be bright enough?”

Most homeowners do not think in watts - they think in the feel of the room. So here is the practical translation.

Lower wattage COB strips (roughly 6-8 W/m) are typically used where you want ambience first: a soft cove perimeter in the living room, a gentle glow in the hallway, toe-kick lighting, or a bedroom cove that should not compete with downlights.

Mid wattage (around 10-12 W/m) is the sweet spot for many residential interiors. It reads clearly as “cove lighting” even with other lights on, and it gives you enough headroom to dim down at night without feeling underpowered during the day.

Higher wattage (around 14-16+ W/m) is for when the strip is doing real work: brighter indirect lighting, higher ceilings, deeper coves that swallow light, or feature walls where you want the light to lift the entire surface. This is also where you need to be more deliberate about heat and driver overhead.

Two trade-offs show up immediately as you go up in wattage per meter. First, heat rises. COB strips spread heat over a continuous surface, so they can run comfortably, but higher power still benefits from proper mounting on an aluminum profile or heat-dissipating surface. Second, driver sizing becomes less forgiving. A small miscalculation that is harmless at 8 W/m can become a flicker or shutdown problem at 16 W/m.

Driver sizing: the math you actually need

If there is one calculation worth doing before you buy, it is this one:

Total wattage = (strip length in meters) x (wattage per meter)

Then add headroom so the driver is not running at its limit all the time. For most residential installs, target 20-30% headroom.

Example: You plan 8 meters of COB strip at 10 W/m.

8 m x 10 W/m = 80 W
80 W x 1.25 (25% headroom) = 100 W driver (or the next size up)

That headroom is not about “extra brightness.” It is about reliability and stability. Drivers last longer when they are not maxed out, and dimmers/controllers behave better when the power supply is not stressed.

One more detail that affects real-world results: tunable white strips (CCT adjustable) are often rated at a maximum wattage that assumes full output. Depending on the strip design, that max may represent both channels at full load. In everyday use you will not always run full-cool or full-warm at 100%, but you should still size the driver for the maximum rated load so your system never hits the ceiling.

Why 24V is common, and where voltage drop bites

Most interior COB strips are 24V because it is more forgiving over distance than 12V. With lower current for the same power, you get less voltage drop and less brightness shift along the run.

Voltage drop is the silent problem that makes the far end of a long cove look slightly duller or warmer. It is influenced by run length, wattage per meter (because it increases current), wire thickness, and how you feed power into the strip.

As wattage per meter rises, long single-end feeds become harder to pull off cleanly. You can often solve it without changing the strip by changing the wiring approach: feed from both ends, or inject power at a midpoint. This matters a lot for long living-room perimeters and open-plan layouts where you might have 10-20 meters of cove.

If you want a simple rule: the higher the W/m and the longer the run, the more you should plan for power injection. It is less about “can it turn on” and more about “does it look even.”

COB strips, dimming, and flicker: wattage plays a role

Flicker complaints in LED strips are usually not caused by the strip alone. They are typically caused by driver-controller mismatch, low-quality power supplies, or pushing a driver too close to its limit.

Wattage per meter matters because it determines the load on the driver and controller. If your strip load is near the driver’s maximum, the driver can run hot, and some dimming systems become unstable at certain dim levels. If you are using a smart controller (for example, a Tuya-based controller), you generally want a stable, appropriately sized constant-voltage driver with comfortable overhead.

Another “it depends” scenario: very low dimming levels. Some systems behave better when the strip is not oversized for the space. If you install extremely high W/m but always dim to 10%, you may find the low-end dimming less smooth than if you chose a more moderate wattage and ran it at a higher percentage. The best setups give you a usable dimming range, not just maximum brightness.

Matching wattage per meter to common home zones

For coves in living rooms and bedrooms, mid wattage is usually the safe bet because it reads as intentional lighting without feeling harsh. In smaller bedrooms or where you already have plenty of downlights, lower W/m keeps the cove as a comfort layer rather than a competing source.

For kitchen cabinets, it depends on whether the strip is task lighting or purely decorative. Under-cabinet task lighting benefits from more punch and good color rendering, so you may lean higher in W/m and prioritize high CRI. For top-of-cabinet or shelf accent, lower W/m often looks cleaner and avoids glare.

For feature walls and TV backdrops, wattage is not just about brightness. Too much output can create distracting reflections on glossy panels or TV screens. A moderate W/m strip in an aluminum channel with a clean install often looks more expensive than a high-power strip that you end up dimming aggressively.

Don’t ignore CRI and CCT - wattage won’t fix bad color

If you care how your wood tones, skin tones, and paint colors look at night, CRI is doing a different job than wattage. You can buy a high-watt strip that makes everything look flat or greenish, and no amount of extra brightness will make it feel “right.”

For residential interiors, especially around dining tables, living rooms, and bedrooms, high CRI COB strips can make the space feel more natural at the same brightness level. Tunable white is also worth considering if you want warm light at night but a cleaner white for daytime use.

This is where planning helps: decide whether the strip is mood lighting, fill lighting, or a functional work light, then pick wattage per meter and color specs together.

A practical planning workflow (so you don’t buy twice)

Start by measuring your real run length, including turns and returns inside the cove. Then decide how the light should behave in that zone - background glow, noticeable cove layer, or a main contributor.

From there, pick a reasonable W/m range, do the driver math with 20-30% headroom, and consider how you will feed power. If a single run is long or high wattage, plan injection points while the ceiling is still open. Also decide early if you want dimming or smart control, because that affects which driver and controller you choose.

If you want to keep it simple during a renovation, buy your strip, driver, controller, and connectors as a compatible set from one specialist retailer so the responsibility for matching the parts is clear. That is exactly the kind of “Lighting Made Simple” path we build at THE LIGHTING GALLERY - local-stock components, practical wattage guidance, and fewer surprises when the installer shows up.

Common mistakes we see (and how to avoid them)

The most common mistake is choosing strip wattage based on price per meter alone. Low W/m can be fine, but it is a problem when it is expected to light a large living area indirectly.

The second is undersizing the driver or leaving no headroom. The strip may light up in testing, but long-term reliability and dimming stability suffer.

The third is ignoring voltage drop until installation day. The fix then becomes messy because adding power injection after the cove is sealed is harder and more expensive.

And finally, people sometimes chase brightness to compensate for poor placement. If the cove is too deep or the strip is mounted in a way that traps the light, a higher W/m strip may just create a hot spot instead of a cleaner glow.

If you are stuck between two wattage options, pick the one that gives you a better usable dimming range and a calmer thermal load. Brightness is easy to reduce with dimming. Heat and unevenness are harder to “dial out” later.

Pick wattage per meter like you would pick the size of an air conditioner: not the biggest you can afford, but the one that fits how the room is actually used - and leaves you margin so the system stays quiet, stable, and predictable every night.