Taking just one example, the current ZooMed Reptisun UVB/LED is different than the tested model. They added 4 more UVA diodes. Unfortunately, the added diodes are 325nm and 340nm, while the UVA range that regulates D3 production is 315-335 (so only two of those diodes will have any effect). The spectral curve in the UV range is still very far from the solar curve.
https://zoomed.com/uvbled/
I am pretty certain that we know the UVA wavelength used for UV self regulation in herps in virtually no species, so if that wavelength is different in intensity from solar irradiance, herps will fail to adequately self-regulate their exposure. So at this point, if the spectral curve in the UV range isn't very close to that of sunlight, there's plenty of reason to believe that the UV being provided will be useless or dangerous.