Grow better, stronger plants with Feit Electric 17-watt Selectable Spectrum LED Grow Lights. These medium-base LED bulbs provide the lighting essential for healthy plant growth while producing considerably less heat and using less energy than standard incandescent grow lights. A21/ADJ/GRW/LED/HDRP bulbs feature 3 spectrum options that you can switch from the bulb itself or rotate through them all with a standard wall switch. Select a blue spectrum to get started in the seed-to-seedling phase. Select the red/white/blue spectrum for vegetative growth. Choose a red spectrum for flowering and fruiting. All in the same bulb! They have an intensity of 24.1/26.5/27.9 PAR/PPF ideal for herbs, succulents, and flowers like primroses and African violets. They are ideal for all phases of plant growth including budding and flowering and are rated for high humidity use making them compatible with most hydroponic systems. LED bulbs produce less heat, so you can place them closer to plants without fear of leaf burn. Grow more in less space. Feit Electric LED grow lights have a long life span of 15,000 hours. Choose a dependable general-purpose grow light for your growing needs.