Some people think that umpire never gets change in a match but they are confused because they wear cap and you don’t identify them in cap.
So the answer is:
If they will get left hand umpire they will not send balls to batsman for the out them from the innings and umpire will be confuse through this process.
We request you to try if you are playing at town level cricket game and ask your association for this.
facts of the day: International matches played always in day or till day light.