It's not potent. Cause it doesn't get you high.
Hemp is not marijuana. Majority of the time when someone is asking how potent is hemp, they are referring to the psychoative effects of cannabis.
In this case, if you smoke hemp flower, you very well may feel some effects from it, but because the THC levels are below the legal limit of .3%, technically hemp cannot get you high.
So the potency is minimal.
Related: Can hemp get you high?