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The output or spectrum of any bulb will begin to decline as soon as it is turned on. Replacing it within the manufacturer’s recommended period of time will help to maintain the health of any photosynthetic species by ensuring they are provided with correct light.
While sunlight may be considered as a mix of colours, many of the light sources produced for the aquatics market are designed to produce a particular range of spectra to match the specific requirements of corals or plants, all associated with the environment in which they have evolved.