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Do you have any more details or "symptoms" that you could provide us with?
I feel like a vague brightening of your surroundings is not much to go on.
Things that you could tell us would include:
When this happens to you, how long does it last? Is it just the room you are in? Is it just the lights that get brighter or do colors seem more vibrant? Do shadows lengthen or shorten or stay the same? Has this happened when you are outside, or just inside? Day or night? How long does this brightness last?
More importantly, do you have headaches when this happens? Do you have a history of epilepsy? Have you received any head or ocular trauma? Did you ever stare directly at bright lights for long periods of time as a child? Do you wear glasses or contacts? Do flashes of light seem to occur in your vision?
**I'm hardly inclined to believe that what is happening to you is anything out of the ordinary. Unless you have been having these brightness fluctuations happening in conjunction with paranormal experiences or other strange occurrences. Please don't leave out any details!