COB vs SMD LED Strip: Which Should You Choose?

Walk into any wholesaler and you’ll hear the same question: COB or SMD? Here’s the practical difference, and which to pick for the job in front of you.

The short answer

COB gives you a continuous, dot-free line of light. SMD gives you individual points of light that usually need a diffuser to look smooth. If the strip will be visible — coving, shelving, plinths — COB nearly always looks better. If the strip is fully hidden or budget is the priority, SMD still earns its place.

What’s the actual difference?

SMD (surface-mounted device)

Discrete LED chips (you’ll see codes like 2835 or 5050 for the chip size) mounted along the strip at intervals. Each chip is a visible point of light. Seen directly, or reflected in a worktop, you get the familiar “dotting” effect — which is why SMD strip is usually installed in an aluminium profile with a milky diffuser.

COB (chip-on-board)

Many tiny chips mounted in a continuous line and covered with a phosphor coating. The result is one unbroken ribbon of light with no visible dots, even without a diffuser, and a wide, even beam. It looks premium straight off the reel.

When COB wins

• Visible runs: coving, open shelving, kitchen plinths, glass cabinets — anywhere you or a reflection can see the strip itself
• Tight curves and corners: the continuous chip layout tolerates bends gracefully
• Minimalist installs: dot-free light without needing a deep diffuser to hide spotting

When SMD wins

• Hidden runs: inside a profile with a diffuser or bounced off a ceiling, the dots disappear anyway — so pay less
• Colour-changing systems: most RGB, RGBW and addressable/pixel strip is SMD-based
• Budget projects: like-for-like, SMD is usually the cheaper metre

Do I still need an aluminium profile with COB?

For a professional job, yes — just for different reasons. With SMD the profile’s diffuser hides the dots. With COB the light is already smooth, but the aluminium channel still matters: it pulls heat away from the chips (extending LED life), protects the strip, and gives a clean, finished edge. See our aluminium and plaster-in profiles.

Whichever you choose, size the driver properly

Both types run on 12V or 24V DC and need a constant-voltage driver with around 20% headroom above the strip’s total wattage. Full walkthrough here: How to choose an LED driver.

See both in stock in London

We stock dot-free 24V COB strip, RGBW SMD tape, IP67 neon flex and all the connectors and accessories at our trade counter, 398 Harrow Road, London W9 — same-day collection or fast UK delivery.

Trade accounts save up to 20% — register in two minutes. For installation work, always use a qualified electrician.