What up Duggz, great question bro. for HID lights I tried a bunch of different fans but the only one I really liked and I kept was the Winflex Silent TT 125W 200u for an extraction power of 1300m3/H , it's got a silent setting and a "built-in aircon" so you can set the output temperature down to 21°C. I call my fan big dick cop killer because it's black and it beats the heat lol. I can put my hand on my cool tube at 600W HID no problem. So it does have a built in silencer but it's still a 125W fan so i'd say it's like 40% less loud than the standard fare 125W no silencer fans. Beyond that, you can always build a "box silencer around it to get rid of the remaining residual noice. Hope this helps ! 🚀