KEY TAKEAWAYS
- COB creates a compact emitting surface
- SMD supports distributed and linear light sources
- COB is commonly used for controlled accent optics
- The complete luminaire matters more than package type alone
01What Are COB and SMD LEDs?
COB, or chip-on-board, mounts multiple LED dies closely on one substrate to create a compact emitting surface. SMD LEDs are individual surface-mounted packages arranged on a circuit board.
02COB Advantages
The compact light-emitting surface works efficiently with reflectors and lenses, enabling controlled beams, strong centre intensity and clean colour mixing. This makes COB common in track lights and recessed accent downlights.
03SMD Advantages
SMD layouts can distribute many small sources over a longer or larger area. They suit linear lighting, panels and broad diffuse systems where uniform coverage and low profile are priorities.
Key Design Considerations
01 COB Accent
Compact source for precise reflector or lens control.
02 Track Lighting
High-intensity beams support retail and gallery accents.
03 Recessed Lighting
COB downlights combine compact size with controlled distribution.
04 Broad Illumination
Distributed LED layouts suit continuous and larger-area light.
04Optical and Thermal Design Matter
LED package type alone does not determine quality. Thermal management, driver performance, binning, phosphor quality, optics and luminaire construction all affect output, colour consistency and lifetime.
Selection Checklist
| Design Factor | What to Check | Why It Matters |
|---|---|---|
| Application | Activities, surfaces and visual priorities | Defines the lighting task |
| Optical Performance | Beam angle, distribution and glare control | Shapes light accurately |
| Light Quality | CRI, CCT and consistency | Supports comfort and appearance |
05Which Should You Choose?
Choose COB for precise accent beams and compact optical control. Choose SMD for continuous linear or broad-area light. Evaluate the complete luminaire and application rather than treating one LED package as universally better.