I te wā e whiriwhiri ana i ngā rama tiriti, ko te putanga lumen tētahi o ngā tawhā hangarau tino nui hei mārama. Ko ngā lumen te ine i te nui katoa o te mārama e kitea ana e tukuna ana e te pūtake mārama. Kāore i rite ki te wattage, e tohu ana i te whakapaunga hiko anake, ko ngā lumen e whakaata tika ana i te kanapa o te rama tiriti.