I understand your skepticism. It seems to have positive effects on everything and there are no negative outcomes with small doses. I can attest that it does absolutely work to firm up skin. Here is a $35 visible light bulb you can press directly against your skin for 8 to 15 minutes per session: https://www.amazon.com/dp/B07JHZYZM2/ref=twister_B07MYQLNL7?_encoding=UTF8&psc=1 Better to get the larger one to save time. I use it to become a morning person by setting my alarm for 6 am and just turning on the light when my alarm goes off. I sit there without direct light exposure and I am awake within 5 to 15 minutes, wherein I do some exposure while my $100 tent steam sauna heats up.

If you want to treat things that need deeper penetration like sore muscles, IR is better: https://www.amazon.com/gp/product/B00QNC2ICM/ref=ox_sc_act_title_2?smid=A3JJM7S8SDXVXM&psc=1 Take off the glass to make contact with the skin. Beware this generates some real heat pretty quickly so I wouldn't use this on your balls!

You will need the power cord for the IR above and below: https://www.amazon.com/gp/product/B00K91S3BS/ref=ppx_yo_dt_b_asin_title_o01_s01?ie=UTF8&psc=1

I haven't used the larger IR above yet but it does come recommended in the right wavelength. I just got this tiny IR one and started using it on my gums yesterday. They are already feeling less inflamed. I also used it on my neck and shoulder for persistent tightness and soreness. Also greatly relieved after one use. https://www.amazon.com/gp/product/B00DHBZRD4/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

Please let me know how it works out for you if you try and of these and best of luck!