The shell on the ReefOptix 3 was made of steel. Mine did have rust, bubling under the paint, after 3 years even though installed in an open frame. It did not effect performance at all though.
The shell on the Lumenmax 3 is all alluminum. It will not rust.
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Greg C.
SPS = Stability Promotes Success
Be wary of advice coming from those who will not show you the fruits of their success!
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