About visible light


About visible light

Reptile Vision

Visible light has a different meaning for various organisms! Ever since man created artificial light, the bulb characteristics were developed to suit human vision. Human eyes have three receptors for color vision. Most reptiles possess a fourth receptor, enabling them to perceive higher-wavelength UVA. As a consequence, reptiles experience a more truthful environment as they would in the natural world. This extended color perception is extremely important for their physiological wellbeing.


Plants on the other hand need again different wavelengths within the visual spectrum for proper growth as they photosynthesize. Photosynthesis is an essential process that enables plants to capture the sun’s energy. Light energy is transformed into sugars and starches. Photosynthesis in plants depends on Chlorophyll, a photosynthetic pigment that absorbs blue light with wavelengths of 430 nm and red light of 662 nm. Green light is not absorbed but reflected by chlorophyll, this is the reason why plants that contain chlorophyll have a green appearance.

Exo Terra has designed different bulbs with a spectrums geared towards the reptile eye, the human vision and for optimal plant growth. Fluorescent bulbs are up to six times efficient than incandescent bulbs in producing visual light since virtually no heat is produced, but its spectrum is limited to certain peaks in particular wavelengths. By changing the composition of the phosphors inside the bulb we are able to tweak those peaks. Once these peaks correspond to the spectral sensitivity of an organism, an ideal visual spectrum for that organism is created.

Quelle: Exo-terra.com