Firstly, I am an admitted Newbie. However, I am a research/data freak. I found complete reviews of various LED grow lights on Youtube. What a difference between products! As a result of this information, I am sending the LEDs I ordered last week back and getting a different kind. According to the research, the LEDs I originally ordered produce about HALF the PAR (the amount of usable light for photosynthesis), and effectively cover 1/3 less area.
I am so glad I did this research. I never would have expected such a difference between similarly priced products.
I would be happy to share info, just not sure if you can post brands here.