The screw-in base of standard grow light bulbs fits sockets on compatible grow light fixtures. They are commonly used in clamp-on and string grow lights. These LED bulbs use less energy than other lighting technologies and run cool so they can be placed within inches of plants without causing wilt or burn. Grow lights emit light in color spectrums that optimize seedling growth, stem and leaf growth, or budding and flowering to grow plants indoors. They are rated for wet locations to withstand high humidity and resist water sprays. Grow lights are used in greenhouses, hydroponic gardening, vertical farming, farm-to-table and urban farming, agricultural research, and other indoor growth applications.