Depends on what you ahve attached to the main power bar in terms of load.
if you are running a series of high wattage MH lighting or large chillers then you are probably getting close to the maximum ampage certified to run on one socket that the whole power bar is plugged into at the wall. This is where the HIGH AMP comes into play and spreads that load across another wall socket.
This is the part so many people forget, the certified load of your wall socket, we could build power bars that have 100 sockets all able to take 20 amp load, but that does not detract from the fact you are restricted by what one single wall socket on your home ring main can handle.
So simple answer, no you dont need the High amp providing you are not exceeding the total ampage of the power bar OR your wall socket.
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