Do COB light strips need transformers? This article explains the key questions!

2025-07-16

The answer is: In most cases, yes! COB light strips usually need to be used with a transformer (also called a power adapter or driver). Here are the reasons:

1. Voltage conversion is the key: We use 220V AC power on a daily basis. However, most mainstream COB light strips on the market (such as the high-quality products provided by Shenzhen Jomo Lighting Technology Co., Ltd.) are designed to work under safe low-voltage DC power (commonly 12V or 24V DC). The role of the transformer is to safely and stably convert 220V AC power into the low-voltage DC power required by the light strip.

2. Safety first: Direct access to 220V high-voltage power is catastrophic for low-voltage COB light strips, which will instantly burn the lamp beads and circuits, and there are serious risks of electric shock and fire. Transformers are an essential barrier to ensure safe use.

3. Stable operation and extended life: Qualified transformers can provide pure and stable low-voltage DC power, eliminate the impact of voltage fluctuations on COB lamp beads, ensure consistent brightness and accurate color, and significantly extend the service life of the light strip.

Do COB light strips need transformers? This article explains the key questions! 1

How to choose the right transformer for COB light strips?

· Voltage matching (V): This is the first principle! Make sure that the transformer output voltage (such as 12V or 24V DC) is exactly the same as the voltage required by your COB light strip.

· Power matching (W): The rated power of the transformer should be greater than the total power of the light strip. Calculation method: light strip power (W/m) x use length (m) x 1.2 (safety margin factor). Insufficient power will cause the transformer to overload and heat, the light strip to dim or even damage.

· Reliable quality: Choose a high-quality transformer that has passed safety certification (such as CE, UL, etc.), has high conversion efficiency and stable output. Poor quality power supply is one of the main culprits of light strip failure.

Suggestions from Shenzhen Jomo Lighting Technology Co., Ltd.:

· Never connect directly to a high-voltage power supply! Safety is no small matter.

· Accurate matching: When purchasing a COB light strip, be sure to purchase or confirm the matching transformer specifications (voltage and power) at the same time.
· Professional guarantee: Shenzhen Jomo Lighting Technology Co., Ltd. provides a full range of high-quality COB light strips and precisely matched dedicated transformers. Our power supply has been rigorously tested to ensure that it provides safe, stable and efficient power support for your light strips, maximizing product performance and life.

FAQ:
· Q: Is there a COB light strip that can be directly connected to 220V?
A: Yes, it is called "high-voltage COB light strip", but it requires a dedicated high-voltage driver and has special installation requirements. Low-voltage COB light strips (12V/24V) are the mainstream and safer choice and must be equipped with a transformer.

· Q: How long can a light strip be with a transformer?
A: It depends on the power of the transformer and the power per meter of the light strip. Be sure to confirm according to the power calculation method above.