Corona

Corona, also known as Corona lighting, was a special type of lighting that used points attached to objects to create more immersive lighting.

Corona Lighting on all 8 of the emeralds

Corona lighting has not had any return or replacement in 2.0 and above. This special type of lighting was restricted to being only visible by OpenGL players. Corona lights could also be attached to players.

Example of corona light attached to sonic's super form