How would you best describe something that is softly bright or radiant?

Describing something as "softly bright" or "radiant" conveys the idea of a gentle yet noticeable light that isn't harsh or overwhelming. Luminous is the ideal word to capture this quality, as it refers to something that emits or reflects light in a way that can appear soft and soothing while still being bright.

In contrast, terms such as gloomy, dull, and obscure connote darkness, lack of brightness, or a certain lack of clarity. Gloomy suggests a dreary or dark quality, dull implies a lack of brightness or vibrancy, and obscure indicates something that is not easily perceived or is hidden. Therefore, these words do not fit the description of a gentle brightness or radiance, making luminous the most appropriate choice for capturing that softly bright imagery.