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High efficiency, quality components, and sturdy construction make the ABI 660nm red grow light the best choice for enhancing your grow environment. The ABI 660nm deep red grow light is especially beneficial during bloom phase, promoting large bud growth and healthy flowers. 660nm is very close to the absorbance maxima of chlorophyl a. Many LED grow lights are deficient in 660nm red. Use this light to enhance and correct your light spectrum. This bulb is assembled in the USA and is backed by a 3-year manufacturer's warranty.