Fresh Water Lamp - 15watt 450mm (18")- Brighter natural colours. - High light output.- Shows the rich greens and colours of plants.- Brightens natural colours in fish.- Encourages plant growth.Until now most lamps offering higher light output have been multi-purpose i.e. both for freshwater or marine aquariums and as such they have tended to be a compromise around what is actually required. A fluorescent lamp can never match the sun?s output but by careful formulation it is possible to maximise light output in the selected wavelengths of light to achieve very good results. In the natural tropical freshwater environment the ideal light is generally closer to overcast daylight (7000K) than say from a marine reef environment (typically 10000K) where the main objective is to replicate light at a depth of 5 - 10 metres where the water appears blue. High plant growth in fresh water environments often creates a very natural green appearance.The Arcadia Freshwater lamp has been spec