Indoor hydroponics greenhouses grow using artificial lighting, just like any other indoor greenhouse. The difference between growing in an indoor greenhouse and growing hydroponically is that you won’t be using soil. Instead the plants are rooted in an inert growing media. An in-line pump then circulates nutrient enriched water through the plant’s root system, while overhead lighting allows the plants to complete the normal photosynthesis cycle they need to grow.
The inert growing media gives you the freedom and control to be much more exacting about how much fertilizer the plant gets and provide the roots with much more oxygen as well.