These full spectrum compact fluorescent lamps (CFL) provide reptiles with pure white illumination that closely simulates natural sunlight and provides beneficial ultraviolet rays in the 290 to 400-nanometer range (U.V.A. + U.V.B.). Provides captive reptiles with the sunlike white light and UV rays they need to thrive! For even more benefit, use these in conjunction with traditional Chromalux full spectrum incandescent basking bulbs, to provide your little buddy some nourishing basking warmth while you get to experience the beauty and vibrancy of his coloration!