How many tablespoons of bottled lemon juice is equal to one medium lemon?

An eighth of a tablespoon of 400 GPL Lime Juice Concentrate when added to 7/8th of a tablespoon of water will equal 1 tablespoon of fresh Lime Juice. Of course, fresh Lime Juice will taste better as the concentrate goes through an evaporation process which hinders the volatile top notes due to heating. Normal fresh Lime Juice is 50-55 GPL (Grams per Liter of Citric Acid) so the reconstitution rate is 1 part concentrate (400 GPL) and 7 parts water.