I do not know what Marelangelo meant regarding substrate, but grasshoppers molt taking advantage of gravity, facing down. You have to give them enough space to hang themselves upside down in the molting process. A mesh streched vertically in the enclosure works fine.
Lubber grasshopper are indeed more colorful, they are also fatter, slower, and very poor jumpers. Most of them have reduced wings. If your grasshoppers do not fit this description, I'd say most chances they are not lubbers.
Grasshoppers must eat something moist, otherwise they will dry out. If they refuse taking in leaves and vegetables you can try giving them a cotton ball that you soaked in water beforehand and see if they drink from it. This is just "first aid". They will still need moist food.
I don't think light is necessary in their enclosure, but many grasshoppers do require heating. They like basking in the sun, so I guess that's why insect wranglers use light bulbs. Depending on the size of the enclosure, you can use 25-40W light bulbs, but I would not recommend anything higher.