A little update on my research.
I don't trust AliExpress or sellers on that platform. So I went on looking for similar items elsewhere. I found a lot of stuff on Amazon and some specialized companies selling overpriced equipment.
What I found is:
The item I posted from
AliExpress comes at around 50$ CAD but has no warranty. So if anything happens, you lose your money... And for 50$, you can't expect anything of quality material, so it's a gamble.
On
Amazon, there are more options, and some of those sellers offer a 12 or
24 month warranty. Plus it's easier to make claims with Amazon than AliExpress (I've had a bad experience with AliExpress in the past).
There is only 1 item that seems suitable and it's 100$ CAD:
Total of 120 LED diode containing 3 chips per diode :
120 x 660nm + 240 x 850nm
But the controller doesn't offer all the modes necessary, such as choosing which light frequency you want, or the pulse.
https://www.amazon.ca/Naviocean-Lig...d2lkZ2V0TmFtZT1zcF9hdGY&psc=1#customerReviews
I read most of the reviews, and a recurring problem seems to be the unit overheating and/or LED dying prematurely.
I did some research on LED and it seems this problem is caused by cheap AC to DC conversion (from the power supply?) which causes LED to overheat and slowly burn out (they emit less and less light until they die completely).
But the company selling this item seems to respond swiftly and fairly replaces items under warranty.
I found a company located in the USA: HOOGA
They have 1 item reasonably priced at 100$ USD and it comes with
3 years warranty.
Red Light Therapy Belt with Adjustable Strap - Hooga
They are quite transparent in their description of specs:
Total of 120 LED diode containing 3 chips per diode :
120 x 660nm + 240 x 850nm
As high as 200mW/cm2 of irradiance
Their remote offer to choose from red, near infrared, or combination mode + pulse mode for a potentially enhanced cellular response.
I wrote them to ask if they could offer a discount, and I got 20% off.
When buying 2, you get free shipping in the US. (total of 160$ USD for 2 units)
For other countries, shipping will be more expensive + you will have to pay duties.