here is an idea. run a flexible dryer hose to the outside.
Dig a small hole about 7" deep and then run the hose to the hole and lay it in the hole.
Cover the hole with a peice of plywood or something then cover the plywood with leaves or other debree found in the area.
The fan in the shed will vent out the dryer hose and the other end will be undergound ....unseen and free from a light source. Also remember to make an exit trough for any water that may get into your exhaust hole. you dont want waterto clog your dryer hose.
Hope I helped.