COB LED vs SMD LED — Full Comparison to Help You Choose the Right Strip

When you shop for LED strips, you’ll encounter two main types: COB LED and SMD LED. Many people wonder what the real difference is, whether they’re interchangeable, and whether the price gap is worth it. This guide compares both types across structure, performance, and practical applications.

The Core Difference

SMD LED (Surface Mounted Device) attaches discrete LED chips at regular intervals across a PCB. Common chip series: 2835, 3528, 5050, 5730. Typical density: 60–240 chips per meter. The spacing between chips is clearly visible, especially up close.

COB LED (Chip On Board) bonds hundreds of micro chips directly onto a copper PCB substrate (320–512 per meter in strip form), then seals them under a single phosphor layer. No visible individual chips — the strip produces a smooth, continuous line of light (dot-free).

Side-by-Side Comparison

Spec	SMD LED	COB LED
Light appearance	Visible individual dots	Continuous, seamless line
Chip density	60–240/m	320–512/m
Beam angle	120°	180°
Cut increment	Every 2.5–5cm	Every 1–2.5cm
Efficacy (lm/W)	90–110	100–130
Price	30–50% cheaper	Higher cost
Repairability	Individual chips can be replaced	Must replace entire section

Pros and Cons in Detail

SMD LED

Advantages:

Lower cost, widely available
Many variants — from basic to premium grade
RGBIC (color-chase effects) are only possible in SMD
Individual damaged chips can be replaced
Lower wattage per meter (4.8–14.4W/m) means less heat generated

Disadvantages:

Individual chips are visible as dots — especially at close range
Requires a frosted diffuser to achieve smooth light appearance
Narrower beam angle requires more positioning care

COB LED

Advantages:

Smooth, dot-free light from any viewing angle
Wide 180° beam angle — soft, even coverage naturally
Higher brightness density in the same footprint
Finer cut increments — more precise installation
No diffuser needed for premium-looking results
Genuinely premium appearance

Disadvantages:

Higher price (30–50% more per meter)
Higher wattage per meter (10–20W/m) — must use aluminum channel
RGB/CCT variants exist but are significantly more expensive
Cannot repair individual chips — replace sections when they fail

Which Applications Suit Each Type?

Choose SMD LED when:

Budget is the primary consideration
You want RGB effects — especially RGBIC chase/addressable effects
The strip will be covered by a diffuser (lightbox signage, etc.)
The installation is temporary or frequently changed
Decorative lighting where color takes priority over smoothness

Choose COB LED when:

Cove lighting where the strip is partially visible — must be dot-free
TV backlights, mirror frames, and wall panels viewed up close
Under-cabinet kitchen task lighting requiring even output
Any premium project where the client or resident will see the strip directly
The goal is a high-end, sophisticated look

Price per Lumen Comparison

Reference market prices (Thailand, 2026):

Type	Price/m	Brightness	Price/lumen
SMD 2835 60 led/m	฿80–150	500–700 lm/m	Lowest
SMD 5050 60 led/m	฿120–200	700–900 lm/m	Low
SMD 2835 240 led/m	฿250–400	1,800–2,200 lm/m	Mid
COB 320 chip/m	฿300–500	1,800–2,500 lm/m	Mid
COB 480 chip/m	฿400–700	2,400–3,200 lm/m	Slightly higher
COB 512 chip/m	฿500–900	3,000–4,000 lm/m	High

In terms of raw lumens per baht, high-density SMD and 320 chip/m COB are roughly equal. But COB wins definitively on visible light quality — smooth, dot-free, directional. If aesthetics matter, COB delivers value that price-per-lumen comparisons don’t capture.

Summary

Tight budget / general decoration / RGB effects → SMD 2835 or 5050
Color-chase/addressable effects → SMD RGBIC
Cove lighting / backlights / premium ambiance → COB 320–480 chip/m
Absolute highest quality available → COB 512 chip/m in aluminum channel

Arumstores stocks both SMD and COB LED strips across all grades, with a team ready to help you match the right type to your project and budget.

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