Answer: There are just simply limits to our perception of light because of our body's disposition and biological components.
Explanation: We can only see the light portion starting off simply because of how our eyes and brain process light. The cones in our eyes that are sensitive to the colors of red, green, and blue can only be stimulated to an extent. There are lights with significantly longer wavelengths such as radio and infrared waves that cannot stimulate these cones. Even other ones such as ultraviolet rays are not detected because they have served as damaging to our bodies, and over time we have evolved to become protected against them. Even when there are established limits to our vision, with a possible slight variation of them from person to person, it does not nullify the idea that there may be plenty of lights and forms of energy outside of our given range.