But it does answer your question. There are different strengths given for vegetative and flowering periods. The amount isn't what you start with either - for young plants in hydro you start with practically just water, adding some nutes every now and then until you're at the amount that's in the Lucas Formula.
Fairly simple. Stay below 0.9 EC when vegging, when you start switching for flowering aim for 1.1 in the first week and up from there. I wouldn't go over 1.5 EC, but I just started growing too so I don't know my shit as well as some others here might.