Rubility Led Grow light Bulb, 12W E27 Indoor Plants LED Grow Lamps for Hydroponic Plants and Indoor Garden Best-selling plant bulbs, 12 LED super bright multi-colored blue and red lights. Red light can help plants generate chlorophyll, blue light helps plants generate carotenoids. For any period of plant growth, for hydroponic plants and earth culture plants. When the plants grow with fill light, general distance blade height is about 0.5 m, 12-16 hours a day continuous exposure can completely replace the sun.