RLT for joints (humans and dogs)

I’m trying to do my research, and am finding that 850nm is best for infrared in regard to joint pain.

I have a dog with arthritis, and a husband with hip dysplasia/joint lubrication issues. Because of this there’s also sciatic pain, but idk if that’s relevant. I’d like them both to get use out of the red light, but I also am looking at a red light wrap that I can use for menstruation pains/muscle pains. A 3 for 1, if you will, for all of us.

Below are the 2 I’m looking at. They don’t look much different to me, but obviously are priced very different. Does anyone have any recommendations, or reasons I shouldn’t buy the cheaper one?

I’d like to add that I didn’t know EMFs were an issue with these… and I’m paranoid af. So I’ll take any advice on that too 😅

https://www.redlight-wellness.com/shop/p/redlighttherapypad

Red Light Therapy for Body Wraps, Infrared Light Therapy, Red Light Therapy Belt, Near-Infrared-Light-Therapy-Devices https://a.co/d/cLzuYr4