I was looking for cheap/effective too. I bought from this German company that's been in business for 100 years...they have a US location too. I bought an open box one and its worked great

https://www.amazon.com/gp/product/B00IVPMZKE/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B00IVPMZKE/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

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This is the product I am using now, and pretty satisfying. It also has extra wavelengths (I believe more than Platinum) Check it out!

1. https://www.amazon.com/gp/product/B07ZCDDLDN/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
2. https://www.amazon.com/gp/product/B00IVPMZKE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

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Look up these two products that I am using now!

Depends on if it's "red light-therapy" or therapy using a red light that might be a red heat lamp, too. That thing's almost like a space heater.