A "bright light" is a strong, intense source of illumination that makes things easy to see. It can describe sunlight, lamps, or flashes that are hard to look at. Figuratively, it can mean a standout person or a hopeful sign.
The tree of life is growing where the spirit never dies, and the bright light of salvation shines in dark and empty skies. Bob Dylan
Bright light is injurious to those who see nothing. Prudentius
We could all be mediums, and all have absolute knowledge, if the bright light of our ego consciousness would not dim it. ... I have myself observed that in states of extreme fatigue, when I am really dangerously physically exhausted, I suddenly get absolute knowledge; ... Marie-Louise von Franz
In the quiet silent seconds I turned off the light switch And I came down to meet you in the half light the moon left. While a cluster of night jars sang some songs out of tune, A mantle of bright light shone down from a room. Elton John
The obliterated place is equal parts destruction and creation. The obliterated place is pitch black and bright light. It is water and parched earth. It is mud and it is manna. The real work of deep grief is making a home there. Cheryl Strayed
Mr. Speaker, our Nation must no longer be complacent about underage drinking and its alarming consequences. We must bring this national public health crisis out of the shadow and into the bright light of a national priority. Lucille Roybal-Allard