This one is not good only 660nm You can try this one https://www.amazon.com/dp/B07JW9RZ7K?ref=myi_title_dp

I don't consume any dairy or grain anymore and it's what made the biggest impact in my energy and cognition. I've actually bought this red light https://www.amazon.com/gp/product/B07JW9RZ7K/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

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There are so many conflicting information out there. My LED is 100-110mw/cm2 at 3 inch , and 80-90 mw/cm at 6 inch.

Those intensity is per second or minute or hour?

For skin improvement, how long should I use the lamp given the intensity?