If Using Certikin Sealed Beam U/W Halogen Lights the choice of cable size is decided by the length of the cable run between the transformer and the desk box. For cable runs up to 21metres 1.55mm is suitable. for cables runs up to 34.5 metres use 2.5mm. The maximum cable lengths shown will produce an approximate reduction in lamp brightness of 10%. The minimum length of cable between transformer and deck box must be 5 metres.
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Certikin Sealed Beam Underwater Light & Components
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