electrical with 3 lights

Two 600w and one 400w. Dedicated 20 amp outlet for lights. What is the best way to hook all three ballast up to timers? With two 600w lights, the plug at thr end of the power strip is VERY warm. (2 ballast plugged into single power strip---》plugged into single timer. plugged into outlet. ) Where the strip plugs into the timer its very warm. So I know adding a 3rd light to the strip is a no go. So how do you suggest I hook up all three lights?

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