What is the term for something that shines with more light?

The term that signifies something that shines with more light is "brighter." This word specifically describes a comparative quality of luminance or intensity. When something is described as brighter, it means it has a greater degree of illumination compared to another object or light source.

In contrast, "dazzling," while it refers to something that can be intensely bright, often connotes a blinding effect rather than a comparative measure of light emission. "Luminescent" describes the property of emitting light without heat but does not imply a comparative brightness. "Glowing" indicates a general level of light emission but does not convey the idea of comparison either. Hence, "brighter" is the most precise term for indicating an increase in light relative to other sources.