Redlightman have some of the best devices out there. They have selected some of the most beneficial wavelengths and they provide critical energy density readings at a number of distances allowing for appropriate dosing. See my article on dosing to understand why this information is critical to good results (*). I have the Red 670 Device. The 830 devices are good for problems requiring infrared penetration. I was lucky to interview Joe from Redlightman for my podcast in 2016. If you’re buying from redlightman you can get a 10% discount off all products with the code RESONANTFM.
I prefer Redlightman for the wavelengths and because of the energy density ratings, which I have verified using my own solar meter on the 670 Device. Prior to getting a redlightman light I tested and used a number of other lights available on amazon. Some people like to use these lights, particularly the 850nm infrared illuminators designed for use with infrared security cameras. Though the 850nm wavelength is suboptimal for most purposes these devices can be quite powerful. These devices do not come with energy density ratings and I don’t believe it’s a good idea to try and calculate it from the input. I’ve tested some very similar looking devices that had large disparities in energy density. These devices need to be individually tested for output.
I tested a light similar to the one below with an output of 200mW/cm2 at 6 inches with the glass still on. That was a very powerful light. That particular brand is no longer listed and there’s no guarantee any of these lights will perform in a similar manner.
I use the Tenmars TM206 to test the output of devices. According to the manufacturer they are accurate for wavelengths between 400nm and 1100nm. LLLT/PBM fits within that range (600-1100nm). These are often quite expensive on Amazon. They seem to come up cheaper on ebay on occasion. There may be cheaper solutions on Amazon, it’s a year or two since I’ve looked into these types of products.
I’ve tested some other red and near infrared LED devices and posted some articles on them….
Red and Near-infrared buyers guide (LED)
Red and Near-Infrared Device Tests
Can A Red LED Flashlight Have Beneficial Health Effects?
There are some effects that can be had from pulsing light. Many of the more impressive studies on hypothyroidism and autoimmune diseases from Ukraine and Russia use pulsed lasers. These devices have a higher peak output then is normally used in LLLT and pulse the beam on and off rapidly. This allows for deeper penetration without heat buildup. There are many other claimed effects from pulsing which I am not familiar with. One of the more reasonably priced pulsed solutions is the B-Cure. This has rapid pulsing and a penetrating 808nm infrared beam of 250mW. While this is lower than many of the clinical pulsed devices it may be powerful enough to provide benefits that cannot be achieved using non-pulsed LEDs. There are a number of different models and I believe the difference is in the pulse rates. Definitely a device to investigate for a specific ailment and choose the most appropriate model.
The (usually cheaper) Classic is available on Amazon UK. They don’t seem to be well stocked.
I use another infrared laser device. This device outputs around 150mW of 808nm infrared. It has pulse settings but the frequency is very low, maybe 2hz, probably useless in terms of pulsing. It also has a number of 650nm lasers around 5mW, probably useless. The devices itself is somewhat useful because of the relatively powerful 808nm laser in the center of the head. I do use this device occasionally because of this and its ergonomics but I think the redlightman and B-cure are better options.