I have screen lids or no lids, and none of my lizards are ever dehydrated or overhydrated. They are in perfect health, confirmed by my vet who sees them regularly.
I mist or bathe my lizards every day or every other day, feed even my collared greens and salad, and I provide a very shallow water dish for the collared.
If you are trying to keep a bogor marsh lizard, then you might want to consider using aless open enclosure. But collareds are semidesert species, and cannot use as much humidity in their environment like arboreal or marsh lizards can. Too much humidity for them can cause Respiratory infections.