Actually, you can say it's the same as the Nexus fans. Nexus takes Yate Loons and undervolts them so they run slower, which makes them quieter.
Published specs:
Nexus Real Silent Fan 120mm 36.87CFM 22.8dBA
Yate Loon D12SM-12 70.5 CFM 33dB
Conceivably, these should be the same fans if you undervolt the YL from 12v to 7v. However, since the LED version has a clear plastic frame, there's a strong possibility that the YL LED will produce more chassis vibration than the Nexus at the same speed.
Owning neither (but having done some research) I'd say the YL at 7v will be a little louder than the Nexus at 12v. However, it'll also give you more headroom.
-z