My ducks are Indian runner ducks and are now in a shed with a large enclosed run, then land behind that. I have a lamp in the shed that they never go under. There always in the run. Which helps with cleaning. I lock them in the shed at night and leave the lamp on with food and water. but I feel guilty in the day if I switch the lamp of. there is so much conflicting advice. I also would like to keep there food in the run only. Then in the spare land. So when is it ok to switch the light off and leave the shed door open.