I finally found it
Night Into Day
this article (above) describes very a similar event from someone else. The biggest difference between mine and this other is, I did NOT see the 'source of the light' in my experience. I don't know much at all about the site's reputation and don't care about it, the description, which is the only one I've ever been able to find. It has details that match, very closely, to what I saw.. . The light's intensity, the duration it lasted, the color of the light etc
Unbleivable sudden daylight
It was as bright as day.
described the light as having a bluish tinge
about 15 seconds
Anyway. . I saw somewhere on this site. . Someone asking if they noticed any patterns of the number 3. The event I witnessed had 3 very defined and different patterns of light with pauses in between each for about 1 second. Each of the three patterns had to be close to 3 second spans. Also, the color, blue. Is Blue significant of anything?