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Ecotech Radion uses 3W LEDs, some of which run at 5W. The point of LED fixture design is to make it as reliable and economical to run and manufacture as possible. Sure its possible to light a tank with 1W or 1/2W LEDs, but the most efficient LED emitters in terms of lumens per Watt happen to be the 3W. Having to solder and interconnect 3 times as many LEDs, while decreasing the overall fixture efficiency hardy makes sense.
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Since May 2011: OLD: 57G rimless NOW: ELOS 120, DIY LED using reefll.com 12-up boards
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