The quality of being bright or luminous.

The intensity of light emitted or reflected.

प्रकाश की तीव्रता

English Usage: Different colors can appear different in brightness under varying lighting conditions.

Hindi Usage: विभिन्न रंग अलग-अलग प्रकाश की तीव्रता में अलग नजर आ सकते हैं.

The quality of being unchanging or unwavering.

The property of remaining the same despite changes.

समानता

English Usage: Brightness constancy is a principle in visual perception.

Hindi Usage: उज्ज्वलता की समानता दृश्य धारणा में एक सिद्धांत है.