Here's an example of what I do to lights. Pretend the X is that checkmark on the beggining of the events.
0. X onActivate --> <Named Brick Here> --> setLight --> Player's Light
1. onActivate --> <Named Brick Here> --> setlight --> None
3. X onActivate --> <Named Brick Here> --> toggleevent --> 1
Note that you have to uncheck event 1.