Same as the other's, and I only spray to correct deficiencies. If the plant doesn't get the moisture it needs from the roots, you'll need to water a little more, or a little more often. But don't keep roots saturated thinking it saves effort. Constantly wet roots rot. Since water easily gets trapped between leaves, spraying in flower is a good way to promote budrot. (mold)

If you do mist, (spray) raise the lights and don't let water 'pool' on the leaves. Standing water clogs the stomas, which are used for gas exchange and can cause dead spots on the leaf over time.

If you need to spray against bugs, remove plant from under lights to get under the leaves and spray the undersides, too. Otherwise, you might spray the bulb, which isn't a good idea. Rinse-off the leaves after treatments are complete and the recommended timeframe has passed. (asap)

Residue can clog the stomas, and could coat (shade) the leaf preventing proper photosynthesis. (kinda like paint or stains protect wood...)
Never "power" spray with a fine stream. Light to medium spraying (misting) only, or you risk leaf damage.