The 50/50 Fluorescent Lamp is a mixture of 50% 6,000K natural daylight and 50% True Actinic 03 Blue phosphors. This full-spectrum lamp provides tank inhabitants with the proper light required for essential biochemical reactions. Organisms dependent on light for photosynthesis will thrive in this lighting environment. Fluorescent lamps are energy-efficient and are engineered to provide superior performance and long life using the highest quality materials available to ensure consistently-rich color.