Exo Terra Natural Light Full Spectrum Daylight Bulb - 25W. The Exo Terra Natural Light is a full spectrum daylight bulb with a very high visual light output and high colour rendering index (98 CRI). With its high visual light output and 6700 K Colour temperature, the Natural Light Terrarium Bulb is recommended as general light source for all terrarium types. New spectrum! Former Repti Glo 2.0Ideal daylight spectrum for all reptiles & amphibiansStimulates appetite, activity and reproductive behaviour through UVA radiationHigh Colour Rendering Index (98 CRI)High visual light output6700 K Color temperatureStimulates plant growthRecommended in combination with Reptile UVB100, Reptile UVB150 or Reptile UVB200, depending on the reptile's UV requirements