Eclipsing Light

You take a pre-exisiting light and add the blackness of Ink to it to give this light the property to cause blindness to someone you have selected when they look at the light, every time the selected target sees the light during the duration of this spell. Every time the selected target if is within 20 ft of the light the target must make a Wisdom (Perception) check, if the targets roll is higher than the Save DC they have high enough perception to see the light, however if they roll lower than the Save DC they are unable to detect the light.