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Conversion factor is different. From a voltage output standpoint, the mV to PAR multiplier of the SQ-500 is 100x, while the SQ-120 is 5x.
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Custom electronics purveyor. blueAcro.com
Current Tank Info: 90g SPS+mixed reef (10 yrs): LEDBrick LEDs, 40g custom sump, Ca reactor, chiller, Vortech, lots of custom electronics
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