Yup. A quick tap of the horn or double tap is fine. Even a 1 second blast. Once we get into 2 seconds blast territory, it transitions to rude, with 3+ seconds going up linearly on the deranged jackass scale

The electrical tape approach is what I did and it did wonders. Went from having a myriad of green and blue LEDs on my fans/portable AC/etc to complete wonderful darkness when I retired for the night. Made a distinct difference in my ability to fall asleep faster at night. I hate having lights when going to bed. Darkness or bust.