About the Marine VHO 50/50 Fluorescent Lamp The Marine VHO 50/50 Fluorescent Lamp is a mixture of 50% 6000 Kelvin natural daylight and 50% blue actinic 03 phosphors. This full-spectrum lamp enhances color and clarity while providing your pet fish wi th the proper light required for essential biochemical reactions. Very high light output makes this lamp perfect for larger aquariums