i use agromax pure uv. comparable with solacure. cant keep it too close, or plant with curl right up. i turn on for four hours in the middle of the light cycle to mimic the midday sun. they will sunburn you if you work under them for too long. they mimic the sun on high altitudes, or close to the equator. they help thc and thcv so far studied. cbd does not have an impact. it is an all natural stresser if you will. makes more trics to protect the seeds. i dont have the camera yet to take the pic, but the trics seem longer, and curlier. and they seem to make the strains kinda ceilingless. i havent gotten sick of smoking the summer run yet, and its april!! all just my opinion from my grow, and my expereince smoking it.
There is a commercial test online somewhere that showed adding uvb only the last two weeks of flower gave the same thc increase as running it full cycle. About 4 more percent thc than with no uv.