Final answer:
Rod monochromats will not be able to perceive color because they lack functioning cones.
Step-by-step explanation:
The difference between rod monochromats and lights equated for cones is that rod monochromats will not be able to perceive color. Rods, which are more sensitive than cones, are responsible for vision in very dark environments but do not yield color information. Rod monochromats have a genetic condition where they lack functioning cones, resulting in a black-and-white version of the world. As a result, they would be unable to distinguish between lights equated for cones.