Although it's probably not considered light by most, for me it would be a basic counter service meal, either a burger or something like a fried shrimp meal from Columbia Harbor House, since most of my dinners are bigger than that at table service locations.
Alternatively, at times I opt for a lighter breakfast if I have a big meal the night before. I usually go for a fruit bowl in this case, with it not sitting on my stomach like a brick and receiving a good amount of energy to start the day as well. It's a good way to go about for lunch too.