To add to this, you get more out of your horn mileage if you get in intervals, especially to your favorite rhythm. It's simply not a Saturday night without me driving blind on a winding road in the dark honking to Staying Alive.
Fun fact: Strong infrared light still damages the eye even if you don't see it. As a bonus, the pupils may be fully dilated due to darkness and let even more IR light hit the innards.