Takanuva's could use his light power to create laser beams that could slice through protosteel.
A Toa of Light was the ultimate weapon against beings of shadow such as the Makuta. Takanuva could temporarily blind an opponent with a flare.
No lone Toa could defeat a Makuta except for a Toa of Light.
Tapping into one's inner light would not suddenly turn oneself into someone with Toa of Light powers. At best, one would be able to hurl a light blast like Av-Matoran could.
Toa-level control over light allowed a being to blind foes with bursts of light, generate lasers, absorb light in a room to avoid detection by an enemy, and perhaps create objects out of solid light.
Toa-level control over light would allow a being to create holograms or objects out of solid light.
Toa-level control over light wouldn't allow a being to blind a specific target by removing their ability to perceive light, but they could absorb all of the light in a room to blind everyone present.[7, 8]