SinoWare Led Grow light Bulb,12W Plant Light for Hydropoics Greenhouse Organic Grow(E27 Socket) This led grow bulb has low power consumption,high luminous efficiency and long service life. the outside is constructed in a pure heat-sink fashion, It does not generate any noticeable heat even 17hrs a day. keeping your temperatures down perfectly. Led grow light have 12 LEDs (3 blue & 9 red), ultra bright. Really helps when the plant need extra boost of light, or a few of sun, raining, snowing , dark indoor etc. Sources rich in red light are more efficient and beneficial for photosynthesis, best for blooming and fruit .The Chlorophyll and Carotenoid need blue much, good for the photosynthesis, best for promoting the leaf. These growing lamps emit the wavelength of light which can be fully absorbed by the plants photosynthesis; no energy waste like fluorescent lights etc. 660 and 430nm; 630 and 460nm are respectively 4 peaks of growth spectrum for maximum chlorophyII A and B production. Plant growing lighting is designed to fit standard E27 socket, brilliant all metal housing, Easy to set up and use - no special lamp needed, a desk lamp will do