"1/4 to 1/2 strength" is meaningless. If you have a 20-20-20 and use it at half-strength, it is the same as using a 10-10-10.
The thing to do is 1) get a formula that provides enough of everything without excesses, 2) decide on a concentration you want to try, so you can see how well the plants do in your conditions, and experiment over the long term.
Personally, I recommend that for a typical in-home grower, 100 ppm N is a pretty good level, assuming it is applied at that strength every 1 or 2 weeks. You can use my calculators to find out the amount to mix up, or for simplicity, just divide 8 by the %N on the fertilizer label. The result is teaspoons per gallon to use.
In my 20-20-20 example, 8/20=0.4, so something in the neighborhood of 1/3-1/2 tsp/gal is fine.
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