KELDAN Filter Concept
The Keldan filter concept uses a red Spectrum Filter for the camera and a blue Ambient Light Filter for the video lights to achieve natural colors when shooting underwater.
The Keldan Spectrum Filter is design to be used with the camera and converts the blue ambient light to white light. The filter characteristics are carefully adjusted not only to balance the RGB color channels but also to correct for a very smooth spectrum with excellent color rendering capabilities.
The Keldan Ambient Light Filter converts the white light of the video light to a blue light which is matching exactly the spectrum of the ambient light.
This approach avoids mixed light conditions and artificial lighting can be used along with ambient light.