its a link to a nutrients / fert website i think its a calculator u put in your KWH price (from ur electric bill, ranges from 5 cents to 15 cents) u put in how many hourss your vegging and how many hours your flowering and the watt of the bulb/ballast your using u press calculate and it tells u how much $$$ its going to cost to "grow veggies" wheres the link ? + <3 to anyone who can give me the link assap !