Here's why:
* Bright: Generally positive, suggesting light and energy.
* Radiant: Positive, implying beauty and warmth.
* Brilliant: Positive, associated with intelligence, talent, or beauty.
* Blinding: Negative, suggesting an overwhelming intensity of light that can be painful or disorienting.
While "blinding" can be used to describe something beautiful or impressive, its primary connotation is discomfort and difficulty seeing.