Spirit lights can do what you're describing and are not to be feared. White lights are often spirits or angels. I periodically see white lights flashing around in the air. I always thought it was an eye issue until a well known psychic told me she saw the same thing and said what it was. I am not 100% sure that's what it is though.
I wouldn't worry.
Enjoy them, talk to them, close your eyes and commune with them when they appear.