Review on Super Silent Blue LED 120mm PC Case Fans 💙 - High Airflow Cooling for Desktops by CONISY (3 Pcs) by Shakim Yates

Shouldn't be surprised, hence the full 5-star rating, but - DUH - if the 3-pin header is used to connect to the motherboard's variable speed fan headers, LED brightness is directly related to fan speed. I get full brightness at 80% power and above (blue tinted image) and then gradually lower the brightness until they are completely off at 40% power (normal color image) and below. The fan still rotates up to 10%. Both shots were taken with the same shutter speed of the camera. Still good fans for the price. I think if you want to control brightness and speed separately. Need a 4 pin fan?