I carry a roll of black electrician's tape in the "glove compartment" with my garage door opener. If riding at night, it takes just a minute to peel off a couple of strips to put across the top of the light. I take them off when I get home without any problem. I was leaving them on, but they don't like the heat. It's much easier just to put them on and take them off every time. Don't ride that much in the dark anyway.
Peace and ride safe
Don