High output 6,400° K lamps simulate natural sunlight and are ideal for cuttings or vegetative growth. Some horticulturist's choose 2,700° K for budding and blooming. SunBlaster's T5 HO lamp produces a light of much greater strength than a conventional tube and, as a result, the energy input into the area being lit is much greater and the light penetration is far superior to anything previously available.