What is synonym of bright?

Here are some synonyms for "bright," depending on the context:

For light:

* Luminous

* Radiant

* Brilliant

* Gleaming

* Shining

* Resplendent

* Illuminated

* Glowing

* Effulgent

For intelligence:

* Clever

* Sharp

* Intelligent

* Astute

* Brilliant

* Quick-witted

* Gifted

* Talented

For colors:

* Vibrant

* Vivid

* Intense

* Saturated

* Brilliant

For other meanings:

* Cheerful

* Optimistic

* Hopeful

* Promising

* Auspicious

The best synonym will depend on the specific meaning of "bright" in your sentence.