EASY GROW Red and Blue - 4 Pack light bars contain red (620nm) and blue (470nm) LED chips to significantly boost plant seeding, flowering, and growth with low power consumption. The wavelength of this type of LED grow lights functions especially well for indoor hydroponic plant growth. They perform well for all seasons and are especially useful in winter. Simply attach the light bars to a plant shelf or fixture at your home or office and watch your plants grow! Highlights * 3 timing settings (6/12/18 hours) * 4 dimmable modes (ranging from 25% to 100%) * Suitable for seeding, houseplants, herbs, vegetables, succulents, and flowers * Especially helpful for early stages of plant growth