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LED, SMD and COB are all LEDs: The difference is how the chips are packaged. A traditional through-hole (DIP) LED holds a chip in a round lens with leads, an SMD LED is a small package soldered flat onto a board, and a COB LED bonds many bare chips into one light-emitting surface. Here is how they compare across 13 key factors.
| Feature | Traditional LED | SMD LED | COB LED |
| Structure | Usually one chip in an epoxy lens with two leads; RGB versions hold three chips with four leads | One or more chips (E.g. 3 in an RGB 5050) in a small package soldered onto the board surface | Many bare chips bonded directly to one substrate under a shared phosphor layer |
| Size | 3 - 10mm lens, stands 8 - 10mm above the board | Very low profile, usually under 2mm tall | Compact, single light-emitting area |
| Light output | Single point of light | Visible dots unless diffused | Continuous, dot-free light |
| Beam angle | ~15° - 60°, set by the lens | ~120° - 160° | ~180° for most COB strips; 15° - 60° in COB spotlights with optics |
| Brightness | Low, suited to indicators | Moderate per package; scales with LED count | Highest brightness density from a single source |
| Color & temperature | Usually one fixed color; RGB versions can mix colors | Wide range of white CCTs, tunable white and RGB | White in many CCTs, often CRI 90+; RGB and RGBW COB strips also available |
| Heat dissipation | Low power, low total heat | Spread across many packages, easier to cool | Concentrated; needs a solid heatsink |
| Energy efficiency (lm/W) | ~20 - 70 | ~120 - 180 in mainstream products | ~100 - 160 in mainstream products |
| Cost | Lowest | Generally lower per unit | Generally higher per unit |
| Manufacturing | Through-hole assembly | Automated pick-and-place and reflow soldering | Die bonding plus wire or flip-chip bonding directly on the substrate |
| Applications | Indicators, signal lights, large outdoor displays | Strips, signage, bulbs, panels, street and decorative lighting | Spotlights, downlights, floodlights, dot-free strips |
| Lifespan (L70) | Varies widely with drive current | 30,000 - 50,000+ hours | 30,000 - 50,000+ hours; depends heavily on thermal design |
| Customization | Basic: Brightness, plus color mixing in RGB versions | High: RGB, addressable, flexible layouts | Moderate: Output, color temperature and some RGB strip options |
An LED (Light Emitting Diode) is a semiconductor that emits light when current flows through its PN junction. A traditional LED is the classic through-hole LED: A chip inside a cylindrical or dome-shaped plastic lens, with metal leads that pass through holes in the circuit board.
The industry often calls it a DIP LED, although strictly speaking DIP (Dual In-line Package) describes rectangular packages with two parallel rows of pins. We call it "traditional" because through-hole packaging is one of the earliest LED package types, used long before surface-mount LEDs became mainstream.
DIP LEDs come in diameters of 3, 5, 8 and 10mm, with 5mm the most common, and the longer lead is the anode. Most emit a single color, but RGB versions combine red, green and blue chips in one lens with four leads, allowing basic color mixing. Today, DIP LEDs are mainly used as indicator and signal lights, and remain a choice for outdoor displays that need high brightness.
Related Article: What is an LED Lamp and How Does it Work?
An SMD LED places one or more chips inside a small, flat package that is soldered directly onto the surface of a circuit board. Common package sizes include 2835, 3535, 3030, 3014, 5050 and 5630, each named after its length and width.
Many SMD packages hold more than one chip; the popular 5050, for example, contains three separate chips for RGB color mixing. SMD is the most widely used LED package today, found in bulbs, panels, strips and even street lights and high bay lights.
A COB LED bonds dozens or even hundreds of unpackaged chips directly onto one substrate, usually metal-core or ceramic, and covers them with a common phosphor layer to create one large light-emitting surface. The result is a single, dense, uniform light source instead of a row of individual dots.
Despite their differences, all three types share the same foundations:
All three rely on the same semiconductor principle, but the way the chips are packaged changes their size, light quality, efficiency, heat, cost and best applications. Here is how they compare.
A DIP LED is usually one chip in a lens with two leads, while RGB versions hold three chips with four leads. An SMD LED is a compact package, containing one chip or several, that sits flat on the circuit board. A COB LED skips individual packaging altogether: Bare chips are bonded directly onto the substrate and share one encapsulation layer, forming a single light-emitting area.
SMD LEDs are far lower-profile than DIP LEDs. A 5mm through-hole LED stands 8 - 10mm above the circuit board, while SMD LEDs usually stay under 2mm tall, which makes them suitable for thin devices like tablets, laptops and TV panels. COB modules concentrate many chips into one compact emitting area, so they deliver far more light per square millimeter than either DIP or SMD.
Think of SMD as a row of small candles and COB as one frosted lamp shade. Because SMD LEDs are individual points, fixtures built with high-power SMD elements can create glare and multiple shadows unless a diffuser is added. COB produces a soft, unified beam with less "sparkle" or point-like structure, which suits downlights, gallery accent lights and hospitality spaces.
This does not mean COB is automatically glare-free. A COB is a very bright, concentrated source, so glare control still depends on the fixture. Both COB and SMD downlights can meet UGR ≤ 19 for offices; COB reaches it more easily with a deep cut-off, while SMD needs micro-prismatic lenses or deeper baffles.
Through-hole LEDs have focused beams of about 15 - 60 degrees, while SMD LEDs offer wider beams of about 120 - 160 degrees. COB beam angle depends on the product. For strips, most COB LED strips emit at around 180 degrees, wider than the 120 degrees of a typical SMD strip. In spotlights and downlights, reflectors or lenses narrow the beam: Common COB downlight beam angles are 15, 24, 36 and 60 degrees.
COB's key advantage is brightness density: A large amount of light from one small, single source. That is why COB is the go-to choice for spotlights, downlights and floodlights. SMD brightness depends on the package and how many LEDs are used. A single SMD package is modest, but a dense board or strip of SMDs can produce very high total output.
Most traditional DIP LEDs emit one fixed color, although RGB versions with four leads can mix colors. SMD offers the most color flexibility. White SMD LEDs come in a wide range of color temperatures, while RGB packages like the 5050 contain three separate chips. By adjusting the intensity of each chip through a controller, an RGB SMD LED can produce a wide range of colors. However, white light mixed from RGB is not as clean or color-accurate as light from a dedicated white LED, which is why RGBW packages add a separate white chip.
COB is mostly used for white light, and it is often chosen for color accuracy. COB strips commonly exceed CRI 90, which helps colors look true in retail or art displays. Color options are no longer limited to white either: COB strips are available in white, single colors, dual white, RGB and RGBW, with white versions at 2700K, 3000K, 4000K and 6500K.
DIP LEDs run at low power, so they produce little total heat. SMD LEDs spread heat across many small packages; their flat mounting puts the LED in direct contact with the board, so heat moves efficiently into the copper layers. COB bonds chips directly to the substrate, which gives a short heat path, but it also packs a lot of power into one small area. Because heat is highly concentrated, a high-power COB fixture may need a large heat dissipation component.
Efficiency (Lumens per watt) and brightness density are two different things. It is like fuel economy versus engine power: A powerful engine in a small car is not automatically the most fuel-efficient. In mainstream products, SMD typically reaches 120 - 180 lm/W, while COB typically reaches 100 - 160 lm/W, usually slightly below top SMD at the same power because densely packed chips are harder to cool, although the gap is narrowing. For example, Cree's SMD 2835 J series reaches almost 180 lm/W.
At the fixture level, the difference shrinks further: Modern COB and SMD downlights both achieve about 90 - 120 lm/W once optic and driver losses are included. Traditional DIP LEDs are the least efficient of the three, at around 20 - 70 lumens per watt.
SMD is a mature technology with an established supply chain, high-yield production and automated mass production, which keeps costs low. COB production is more complex, requiring cleanroom environments, precision coating and tight quality control, which raises costs. The premium varies by product: COB displays cost on average 10 - 20% more than SMD displays with equivalent specs, while COB strips are typically 20 - 30% pricier.
Maintenance also affects total cost. With SMD strips, individual damaged LEDs can be replaced, whereas a COB light source is usually replaced as a whole module.
In SMD production, machines place components onto solder paste and then reflow them to form the connections, handling hundreds of components per minute. In COB production, the bare die is attached to the board, connected with fine gold or aluminum wires, covered with a protective resin, and then electrically tested. Some COB designs use flip-chip bonding instead of wire bonding. For encapsulation, silicone is widely used in lighting because epoxy tends to yellow under long-term heat or UV exposure and is now mostly reserved for low-power indicator LEDs.
Each type has its natural home. DIP LEDs are used in indicators, signal lights and outdoor displays that need high brightness. SMD LEDs are used almost everywhere: Bulbs, panels, signage, LED strips, decorative lighting and commercial spaces such as restaurants, bars, hotels and retail stores. At Hirosart, we use SMD LEDs in some of our epoxy lamps.
COB is better suited to indoor directional lighting that needs high uniformity and high color rendering, such as downlights, spotlights and track lights, as well as floodlights and dot-free linear lighting.
LED lifespan is not the point where the light switches off, but the point where it becomes noticeably dimmer. Lifetime is commonly reported as L70 or L80, the hours until output falls to 70% or 80% of its initial level, and both SMD and COB can reach 50,000+ hours with correct thermal and current conditions. Treat headline numbers with care: Figures such as 25,000 or 50,000 hours are only useful for comparison when the test conditions and failure criteria are known.
Traditional LEDs offer basic customization: Brightness control, plus simple color mixing in RGB versions. SMD offers the most flexibility. RGB packages allow each color channel to be controlled independently, and addressable versions with built-in driver ICs let every LED on a strip be controlled individually for effects like chasing or rainbow patterns.
COB customization focuses mainly on output, beam angle (Through optics) and color temperature. RGB and RGBW COB strips exist, but COB is less convenient for high-resolution pixel effects.
LED, SMD and COB are not rivals from different technologies, but different ways of packaging the same semiconductor light source. SMD wins on flexibility, efficiency and cost; COB wins on uniformity and brightness density; traditional LEDs remain the simple choice for indicators. By matching the type to your application, budget and thermal design, you can light your space effectively and efficiently.
All three are LEDs. A traditional through-hole (DIP) LED is usually a single chip in a lens with two leads. SMD packages one or more chips into a small component soldered flat onto a circuit board. COB bonds many bare chips directly onto one substrate, producing a single, uniform light-emitting surface instead of individual points of light.
COB delivers more light from a single compact source, which makes it the stronger choice for spotlights and downlights. In lumens per watt, however, mainstream SMD LEDs usually match or slightly exceed COB.
SMD is the more common choice for LED strips because it is cost-effective, efficient and available in many colors, including RGB. COB strips cost more but give a continuous, dot-free line of light and often higher CRI.
No. The code describes the package's physical size in millimeters (5050 = 5.0 x 5.0mm). Brightness depends on the chip and drive power, so check the lumen rating. Many budget LED strips use low-power 0.2W versions of packages like 2835, which can be dimmer than a 5050.
No. COB offers smoother light and higher brightness density, while SMD is more efficient, more flexible, easier to repair and better suited to RGB or pixel effects. The better choice depends on the project.
L70 is the number of operating hours until the LED's light output drops to 70% of its original level. The LED still works after that point, it is just dimmer
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