Need Electrical Advice . . . MH Cord Length

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Have the PFO 250w DE Pendents (Hamilton bulbs). The cable between the pendents and ballast was ~8'. I contacted PFO directly about additional length as wanting to put the ballast in basement as well. They recommended a use of one extension cable only for a total distance of ~ 16'.

For my PFO's the cable (between ballast and lights) wasn't a standard type extension cord so ended up getting from OA.