I just replaced the loud stock fan in my range hood with a quiet 12V
computer case fan, and the not very bright stock light with LED pads.
This was a very easy upgrade, total cost $30.
The key thing - a 200 Millimeter Cooler Master Computer Case Fan fit perfectly in the fan opening in the range hood. It is also 12V
just like the old fan, but it's much quieter, and it seems to move plenty of air. Cost was $16.
To install the new fan, first I removed the fan casing (super easy, just four philips screws) and then removed the old fan. Then I sealed the edge around the opening in the fan casing with foam window sealing tape, then I attached the new fan with four bolts and nuts. I used a little bit of duct tape to seal the holes in the fan casing where the old motor was mounted.
I removed the old incandescent bulb and holder, added a reflector made out of a scrap of aluminum I had laying around, and attached the new LED pads to the reflector. I had two LED pads laying around from when I replaced all my interior lights - I think they cost about $5 each.
The only remaining step was wiring the new fan and LED pads into the existing wiring and re-installing the fan housing.
Total time less than one hour - the range hood lighting is now much brighter and more usable, and the fan is nearly silent.
The pictures below are several views of the fan housing just prior to re-installing it in my trailer.