Yes, grow lights can be just as beneficial as natural sunlight. Research your herbs and determine the sunlight hours needed and try to mimic that as similarly as possible to realistic hours in the day. Grow lights, if used too much, though, could burn your plant. Knowing that your herbs need plenty of light, also know that you cannot give them excessive light since that would be counterintuitive. It is best to determine your plant needs and add a grow light with a timer to keep your plants routine.