I like this idea – but would prefer the cone to be the same colour but less opaque (weaker) if the creature is at disadvantage to see you. The reason being, a single cone for a creature with darkvision might extend from dim light into darkness. So in the dim light it would be strong, but in the darkness weaker.

EDIT: Following that logic, a creature with normal vision would have a weak cone in dim light, and no cone in darkness. You could make the weak part of the cone more yellow/orange, and the strong part redder, to show the level of danger.

Last edited by LukasPrism; 21/02/22 05:37 AM.