Yes its true that a 400W HQI ballast is a Son AGRO ballast more commonly used to fire up HPS bulbs in the hydroponic industry. The aquarium industry has adopted these Son Agro ballasts as the equivalent of a 400W HQI ballast. As much of a misnomer as it is, since we are discussing it on a Reefing board, I feel it is appropriate to refer to it as a 400W HQI ballast regardless if one actually exists.
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If people don't die, it wouldn't make living important.
And why do we fall? So we can learn to pick ourselves up.
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