When purchasing COB LED floodlights, you may notice the terms "internal driver" or "external driver" on the specification sheet. It is not always clear what the difference is-or which one you should choose. While this may seem like a simple question, it actually has a direct impact on installation costs, the lifespan of the fixture, and future maintenance.
To give you a direct answer: all COB floodlights require a driver to function. The only difference is whether the driver is housed inside the light fixture (internal) or placed outside of it (external). COB chips are low-voltage DC (direct current) components, while mains electricity is AC (alternating current); a driver is necessary to step down the voltage and provide a constant current. Let's break this down.
Why COB floodlights require a driver
The operating principle of a COB chip makes it highly sensitive to electrical current. Even a slight excess in current can accelerate light degradation (lumen depreciation) or, in severe cases, cause the chip to burn out entirely. A driver performs three primary functions:
AC-to-DC conversion: It converts 100–277V AC mains power into the DC power required by the chip.
Constant current output: It ensures a stable current, protecting the chip from fluctuations in the power grid.
Basic protection: This includes safeguards against overvoltage, overcurrent, and short circuits; some models also feature surge protection.
Therefore, there is no such thing as a COB floodlight that "doesn't need a driver." If a light appears to "turn on as soon as it's connected to power," it simply means the driver has already been integrated into the fixture housing-it's just not visible to you.
Characteristics and applications of internal drivers
An internal driver is integrated within the fixture's housing, sharing the same enclosure as the COB light source.
Advantages:
Simple installation: The unit is ready to use once connected to a power source, with no need for additional wiring or mounting a separate driver box.
Clean appearance: There are no external components attached to the fixture.
Integrated waterproof design: With fewer sealing points, the risk of water ingress is relatively lower.
Limitations:
Because the driver is located close to the light source, the thermal load is concentrated. If the heat dissipation design is inadequate, the electrolytic capacitors inside the driver can age prematurely due to heat-this is the most common cause of failure in fixtures with internal drivers. If the driver fails, it often necessitates replacing the entire light fixture or disassembling it for repairs.
Suitable applications: Low-to-medium wattage (10W–100W) installations-such as in courtyards, on exterior walls, for signage, or around the perimeters of warehouses-where ease of installation is a priority.
External Drivers: Characteristics and Applications
An external driver consists of a power supply housed in a separate, waterproof enclosure, connected to the light fixture via cables. This configuration is commonly found in high-wattage floodlights.
Advantages:
Separating the driver from the light fixture prevents heat from affecting either component, typically resulting in a longer lifespan for the driver.
If the driver fails, only the power supply needs to be replaced-leaving the light fixture itself untouched-which lowers maintenance costs.
The light fixture can be designed to be thinner and lighter, making it better suited for mounting on tall poles.
It is easier to integrate dimming drivers (e.g., 0-10V, DALI, etc.).
Limitations:
Requires additional space to mount the driver enclosure, and the wiring process is more complex.
Connection points and joints are potential weak spots for waterproofing; improper installation can lead to water ingress.
Suitable applications: High-wattage projects (above 150W), stadiums, public squares, and installations requiring dimming control.
How to Choose for Your Project
Consider the following questions to help make your decision:
What is the wattage? For fixtures under 100W, an internal driver is generally preferred; for those above 150W, an external driver is recommended.
How high is the mounting location? For installations on tall poles or high walls, an external driver reduces the weight of the light fixture and eliminates the need to climb to great heights for future maintenance or full-unit replacement.
Is dimming required? If dimming is needed, there is a wider range of options available with external drivers.
Is the environment extreme? In areas with high temperatures, high humidity, or coastal conditions, an external driver offers better stability by isolating the heat source and protecting components from moisture.
What are your budget and labor cost considerations? Internal drivers save on initial installation time, while external drivers reduce long-term maintenance costs-decide which factor is more important for your specific needs. 6. Often-Overlooked Details When Selecting a LED Driver
Whether the driver is built-in or external, the following points are worth checking:
Input Voltage Range: Ensure it covers your local power grid (e.g., a wide-range input of 100–277V).
Power Factor (PF): A value of 0.9 or higher is generally recommended.
Surge Protection Rating: For outdoor fixtures, a rating of at least 4kV is recommended-higher if the location is prone to frequent thunderstorms.
Ingress Protection (IP) Rating: If the driver is external, the driver enclosure itself should be rated IP65 or higher.
Brand and Certifications: The driver is the component most prone to failure in a light fixture; verify that it carries relevant certifications such as CE, UL, or SAA.
Warranty Terms: Confirm whether the warranty covers the driver; some manufacturers offer different warranty periods for the light source and the driver.
Summary
COB floodlights always require a driver-the only question is where it is located. Built-in drivers offer convenient installation and a sleek appearance, making them ideal for low-to-medium wattage applications. External drivers provide better heat dissipation, easier maintenance, and flexible dimming options, making them better suited for high-wattage and professional engineering projects. When making your selection, focus on wattage, installation height, dimming requirements, and the operating environment-while also ensuring the driver meets standards for surge protection, power factor, and certification. Choosing the right driver is often more critical to the actual lifespan and user experience of a light fixture than the specifications of the light source itself.
Looking for the right COB floodlight solution for your project?
We offer both built-in and external driver COB LED floodlights, with power ratings ranging from 30W to 400W. We also support dimming, custom beam angles, and OEM/ODM services. If you are sourcing for an engineering project, wholesale procurement, or brand selection, please send us your project requirements (wattage, installation environment, and quantity). We will recommend the best-fit solution and provide a quote along with samples.
