Reviewing 15W COB LED 120mA

Reviewing 15W COB LED 120mA

LED lamp brightness should be tested with specific instruments that measure light intensity in lumens and power consumption with a watt meter. Dividing these two yields a value known as lumens per watt (Lm/W), which is used to compare LEDs. It implies that the better the LED, the less power it consumes and the more light it generates. Unfortunately, I lack this equipment, and I only evaluate the electrical properties of LEDs and their drivers. Although it is not a comprehensive evaluation, it may be valuable for certain individuals because I have not seen these reviews elsewhere. On the other hand, many low-cost LEDs on the market lack a true nominal power rating.

I’ve got a 15W COB LED with a current of 120 mA that I’d want to put to the test. I performed the test by connecting an up to 18-watt 120 mAh driver to the LED. The following are the requirements for the required driver:

Input voltage: 175-265 AC

Output voltage: 20-155 AC

Output current: 120 mA

Power factor: 0.55

Photo of driver with IC BP2866B:

(The resistor under the driver IC was assembled like that from the beginning and I did not touch it)

Specifications and photos of the desired LED:

Circle diameter: 50mm

Current: 100-120 mm

Voltage: 144 volts

When the temperature reached equilibrium in 2 minutes, the AC wattmeter read roughly 16-17 watts, and the current on the DC side of the circuit reached 117 milliamps. The voltage ranged between 138 and 140, as you can see. Meanwhile, the power factor was 0.63, similar to most non-isolated drives. While there are non-isolated switching devices on the market with power factors of 0.9 or higher, these are uncommon and, most significantly, a little more expensive. Notably, there are no IEEE standards for these drivers.

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