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Guys could anyone tell me what the electricity bill would be running a 600w hps on 18/6 for 60 days?

Hey guys, new here and have only done 1 grow about 6 years ago using soil and cfl. Im now considering growing 12 plants in hydro under two 600w HPS lights. The reason I need someone from Ireland to answer is coz I have no idea where to buy the equipment since all the head shops are shut down...