From Carettochelys.com:
- Light system - Even though Carettochelys does not bask, it still needs either day light (applies for outdoor setups) or a full-spectrum light (applies for indoor setups). When I write 'Full Spectrum', I mean all the wavelengths, so do not get cheated for there are many products who's manufacturers claim they produce full spectrum light while they do not. The light is required in order to acquire vitamin D3 that is needed for utilizing Calcium, an essential mineral for the skeleton, carapace and plastron.