A cove either looks built-in or it looks like an afterthought, and the difference comes down to about four measurements. Here they are.

Standard cove ceiling dimensions: the quick reference

If you only need the numbers, this is the table to screenshot for your contractor. These are the standard cove light ceiling sizes that work for Singapore homes with 2.6–2.75m slab ceilings. Each dimension is explained in detail in the sections below.

Two caveats before you pass these to your ID. First, these dimensions assume the cove is washing the ceiling, not the wall — wall-wash coves need a different setback. Second, if your false ceiling is already low (under 2.4m finished), a full 200mm drop costs more headroom than it is worth; see our guide to ceiling lights for low false ceilings before committing.

1. Cove height: where to place it

The goal is a soft ceiling wash with no hotspots.

• Typical HDB ceiling (2.4m): set the top of the cove 150–220mm below the slab.
• Why: the beam needs throw distance to open up before it reaches the ceiling. Too close and you get a bright band instead of a wash.
• Ceiling fans: keep the cove clear of the blade radius, or the blades will chop the light and you will see it flicker.

If you are unsure, 200mm down from the ceiling is a safe default.

2. Pocket depth and setback: hiding the source

Clear pocket depth: 60–80mm.
Strip setback from the lip: 30–45mm.

Get these right and you see glow, never the source. Get them wrong and you see the strip itself — which is the single most common reason a cove looks cheap.

Use an aluminium profile inside the pocket. It keeps the line straight and helps the strip shed heat, which matters more than most people think for how long it lasts.

3. Output and dimming

For a living room, plan on roughly 120–200 lux of ambient light from the cove.

The KAYVA 480 Pro Strip runs at a fixed 12W per metre — around 1,000 lumens per metre. That is deliberately at the bright end. You dim it down to the level you want rather than buying a dimmer strip and being stuck with it.

The trade-off, stated plainly: the 480 Pro is Ra95+ with R9 above 50, and high colour rendering costs you lumens. A generic Ra80 strip will beat it on the spec sheet at the same wattage. It will also make timber, skin and food look flat. Here is what that actually looks like.

4. Diffuser choice: dot-free by design

• If the strip is visible at any angle, use a deep profile with an opal diffuser.
• If the strip is fully hidden in the pocket, COB already gives you a continuous line. A cover still helps keep dust off it.

Colour temperature: 2700K for a warm, hotel feel. 4000K if the living room doubles as a workspace. Pick one and commit — a cove is not a place you want to be changing your mind about.

5. Driver sizing: never under-power

Use a 24V constant-voltage driver and size it with headroom.

Driver wattage = 12W/m × total metres × 1.2

A driver running at full capacity runs hot and fails early — and it is usually buried above a plastered ceiling where you cannot reach it. Use the sizing calculator rather than guessing.

Voltage drop: for runs over 6 metres, feed the strip from both ends or split it into segments. Otherwise the far end will be visibly dimmer than the near end, and you will notice it every day.

6. Dimming and control: what actually works

The strip dims. The driver does the dimming — the strip itself is a passive 24V load and has no electronics of its own.

So if you want a dimmable cove, you need a dimmable 24V constant-voltage driver. Two routes:

• Wall dimmer: a phase-cut dimmable 24V CV driver paired with a trailing-edge (ELV) wall dimmer. Leading-edge (TRIAC) dimmers commonly cause visible flicker on COB — this is the most common complaint after a renovation, and it is entirely avoidable.
• App or voice control: put a 24V CV controller between the driver and the strip. Tuya, Aqara or any comparable brand will work — the strip does not care whose controller it is. What matters is that the controller is rated for your total wattage and dims by high-frequency PWM, not a cheap low-frequency one that will strobe on camera.

KAYVA does not make smart products. Apps, hubs and firmware are extra points of failure, and we would rather sell you something that still works when the WiFi is down. But if you want app control, the 480 Pro will take it — we would just rather you knew what you were buying.

Set daily use to around 70–80%. It is more comfortable and it is easier on the strip.

7. Installation notes your contractor will appreciate

• Mark the strip path before the carpentry goes up.
• Run a dedicated spur to a driver location that is ventilated and accessible. Not sealed inside the ceiling.
• Bench-test the full run before anything is closed up.
• Respect the profile's minimum bending radius. Never crease the tape.
• Mains connection must be done by a licensed electrician. The low-voltage side, driver to strip, is safe to handle unpowered.

Common pitfalls

• Pocket too shallow → you see the diodes, and you see glare.
• No dimming → the room feels flat by day and harsh at night.
• Driver with no ventilation → it runs hot and dies early, somewhere you cannot reach.
• One feed on a long run → voltage drop, and one end of your ceiling is dimmer than the other.

FAQs

What is the standard size for a cove light ceiling?
For a typical Singapore living room with a 2.6–2.75m slab: a 150–220mm cove drop (200mm is the safe default), a clear pocket depth of 60–80mm, and the strip set back 30–45mm from the lip. These three numbers cover most builds.

What are typical cove ceiling dimensions for an HDB living room?
The same standard dimensions apply — 200mm drop, 60–80mm pocket, 30–45mm setback. HDB slabs are usually 2.6m, so keep to the lower end of the drop range (150–180mm) if you want to preserve headroom. The trade-off: a smaller drop means the light throws a shorter wash across the ceiling.

How deep does a cove need to be for an LED strip?
A clear pocket depth of 60–80mm. That is enough to hide the strip, its aluminium profile and the wiring, and to stop hotspots being visible from a seated position. Going shallower saves almost nothing in build cost and is the most common reason coves end up showing dots.

Can the cove be my only living-room light?
For ambience, yes. You will still want task light for reading — a floor lamp or a few spots.

Warm or neutral?
2700K for a cosy room. 4000K if you work there. Most Singapore living rooms are better at 2700K.

Do I need an aluminium profile if the strip is hidden?
Recommended. It keeps the line straight and helps the strip run cooler, which is what determines whether it still looks the same in year five.

My living room is 6.5m wall to wall — how many feeds?
Two. Feed from both ends. At 6.5m on a single feed you will see the far end drop off.

KAYVA 480 Pro Strip — 480 LED/m dotless COB, Ra95+ with R9>50, 24V, 20,000 hours at L70. Tested on every batch.