Hi there, I run the same n my DSR, you can hear the fan, but the light output is great and nice and white. I was running them in my Triumph Tiger for a year - a bit of fun to fit, easier when you remove the headlamp assembly!
Good upgrade to stock H4 bulb.
I fitted LED indicators inserts again previously from the tiger - perfect fit!
With little sound, making yourself seen and defensive riding are really important!
Tim