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[Johnny Reefer]

On my 135g Cichlid tank I have a 72" Lunar Aqualight. It has 6 x 3/4w moonlights. The light penetrates very nicely and looks way cool to me.

On my 135g Reef tank I have a 72" Aqualight Pro. It has 4 x 1w moonlights. Again, the light penetrates nicely and looks way cool.

I think with those single 3/4w units, they are meant for small tanks. Put one on a 10g or 20g and your good to go.

But for a 4' 90g you'd need to put up 4 of 'em to do any good, IMO.

Probably wouldn't hurt to look at other options for a 4' 90g, IMO.

Cheers,