Superdream 36 Watt Advanced Spectrum MAX DUAL BAND 3w-Chip LED Grow Bulb Our Advanced Spectrum LED's come with an industry leading 1 year warranty against manufacturer defects, and are all backed with a 120 day satisfaction guarantee The lens on our Advanced Spectrum LED's are designed for optimum light penetration! Unlike 120 degree lenses that have weak light intensity and 60 degree lenses that offer hardly any coverage, the 90 degree lens we offers a happy medium Advanced Spectrum LED's are designed to be the coolest running LED's on the market. Its aluminum body is design to cool easily and stay cooler than other LED's are on the market The blue spectrum (430-460nm) is on the lower end of the spectrum and promotes the growth of leaves during the vegging stage. The red spectrum (630-730 nm) promotes flower growth along with budding during your flowering stage Our Advanced Spectrum LED's have a 50,000 hour lifespan, which is more than twice the lifespan of HID bulbs