3W 5W 7W COB LED Chip Surface Light Source with 120LM/W Efficacy and Gold Wire Construction

These COB (Chip on Board) LED lamp beads offer a compact, high-efficiency lighting solution for commercial and residential fixture manufacturers, lighting technicians, and electronics hobbyists. With a luminous efficacy of 120 lumens per watt and a colour rendering index of 80, these chips deliver bright, colour-consistent light suitable for downlights, spotlights, track lighting, and retrofit modules. The 120-degree beam angle ensures even light spread, reducing the need for multiple sources. Available in 3W, 5W, and 7W power ratings with your choice of warm white, neutral white, or daylight white colour temperatures, these surface-mount components are versatile for various design requirements.

Features and Construction Details

Each COB LED chip is engineered for reliable performance in demanding lighting applications. Construction choices including gold wire bonding and a heavy gold aluminium substrate support heat dissipation and electrical stability.

Material and Build

The chip uses gold wire for internal connections, providing consistent electrical paths. The substrate is heavy gold aluminium, which helps draw heat away from the LED junction. This combination is common in high-power COB designs where thermal management is critical to maintaining light output and lifespan.

Size and Practical Fit

The overall dimensions are 50 by 7 millimetres, with a luminous surface area of 28 by 6 millimetres. This compact form factor integrates easily into standard reflector housings or custom PCB layouts. The chip thickness is minimal, allowing for low-profile fixture designs without compromising light output.

Electrical and Optical Specifications

Forward and backward voltage range is 9 to 11 volts. Rated current is 300mA. The colour tolerance is restricted to 5 SDCN, meaning colour consistency across chips is tight. Luminous flux is rated at 120 lumens per watt. Thermal resistance is ≤5°C/W, and the maximum allowable junction temperature is 150°C.

Uses and Placement

These COB LED chips are designed for integration into indoor lighting fixtures where high efficiency and good colour rendering are needed. The range of power and colour temperature options makes them suitable for both accent and general lighting.

Commercial Lighting Fixtures

Use in downlights, spotlights, and track lighting heads for retail displays, offices, or hospitality spaces. The 80 CRI provides natural colour rendition for merchandise or decor. The 120-degree beam angle covers wide areas without harsh shadows.

Residential and DIY Projects

Ideal for custom lamps, under-cabinet lighting, or retrofit upgrades. Choose the 3W version for low-level task lighting, the 5W for general room light, or the 7W for brighter areas like kitchens or workshops.

Prototype and Low-Volume Manufacturing

With selectable quantity options (1, 5, or 10 units per order), these chips are suitable for prototyping and small-scale production runs. The standardised form factor simplifies mounting into existing designs.

Benefits and Buying Value

These COB LED chips offer measurable performance specifications that contribute to efficient, reliable lighting. The combination of efficacy, thermal design, and colour consistency provides practical value for both professionals and hobbyists.

Efficiency and Long-Term Operation

With 120 lumens per watt, these chips convert more electricity into visible light, reducing energy consumption compared to older LED or halogen sources. The 80 CRI rating ensures that colours appear natural, which is important in retail or design environments.

Thermal Performance and Reliability

The heavy gold aluminium substrate aids in heat dissipation, helping to keep the junction temperature within safe limits. A thermal resistance of ≤5°C/W and a maximum junction temperature of 150°C allow the chip to operate reliably under standard conditions. The product has undergone 1000-hour regular ageing testing with 85% performance retention.

Practicality and Versatility

Multiple power options and colour temperatures in the same footprint reduce your need to redesign fixtures for different applications. The gold wire construction provides consistent electrical performance. The wide 120-degree beam angle simplifies optical design, often requiring no secondary lens for uniform spread.