Don's Home Health Light Therapy
 

last updated 20 Nov 2021
Light therapy can be used for:

Muscle and Skin Pain:
Deep Red 630 670 nm or 650 nm plus Near Infrared (NIR)850 nm

Deep-tissue optical imaging of near cellular-sized features | nature.com sites A study using NIR-I imaging reported a maximum penetration depth through tissue of ~3.2 cm (1.5in)


Does it work:
The review of studies published at the NIH below says there is evicence they work for pain associated with exercise, says that it can help.

Photobiomodulation (PBM) in human muscle tissue: an advantage in sports performance? ncbi.nih.gov compared studies of the results of 2 kinds of Light Therapy both after injury and before exercise to improve performance and prevent injury and reduce delayed onset muscle soreness (DOMS).

They looked at 2 types Low-level laser therapy (LLLT) (800 nm and 970 nm) or light-emitting diode therapy (LEDT) (850 nm and 660 nm).
Several studies showed a decrease of CK levels.
CK (Creatine Kinase protein) can rise after muscle injury.

There were studies showed positive results with both LLLT and LEDT.
Some studies had ambiguous effects (both positive and no effects.


Treating Sports-related Injury and Pain with Light Therapy | PracticalPainManagement.com compared RICE (rest, ice, compression, elevation) and a 820 nm laser with RICE alone. Analysas of Variance (ANOVA) showed a significant reduction in the volume of the edema with the combined therapy vs RICE alone.

Conclusion: PBM Works:

Red Light Photobiomodulation Buyers Guide | PrimalHacker.com has a lot of technical information supporting JOOVV in the red light visible spectrum 600-700 nm wavelength.
They are supporting Joovv


Intensity:
NASA-supported research and many other published studies have utilized an intensity of 4 to 6 Joules/cm2 of energy delivered to the body. That translates to about 50-100 mW/cm2. For the relief of deeper symptoms, like joint inflammation, up to 120 Joules/cm2 has been shown to be very effective.

Exact action spectra for cellular responses relevant to phototherapy PubMed.gov references articles on various biological responses of HeLa cells irradiated with monochromatic light of 580-860 nm.


I couldn't find any studies comparing different devices or specific information on power etc..
Popular Light therapy devices on amazon are in the $90-$160 range.
But there are devices up to $400.

Devices
Amazon Search

There are many companies selling a handheld red-light/IR LED light therapy wand, which held touching to 1 inch away from the target area for up to 5 minutes at a time, 1 (light pain) - 3 (deep pain) times a day will efficiently heal and relieve your pain within 1 month..
FDA Class 3 Light Therapy
wavelingth: 630, 660 nm Deep Red light and 850 nm Infrared
Irradiance: 141 mW/cm3
Illumance: 180 lux at 15 cm ( 6 in.)

NovaaLab Pro, Tometc , TENDLITE, Quantum Rejuvenation all seem to be the same thing for around $150 - 630nm, 660nm & 850nm
RedTonic $120 and Lifepro $100 apear to be the same but cheaper. P> Joovv Red Light Therapy is a large red light display
Curious about Joovv? Get the lowdown on red-light therapy first | CNET


Terms:
 LED - Light Emitting Diode
 LLRLT - Low Level Red-Light Therapy
 Low-level laser therapy (LLLT) (800 nm and 970 nm)
 light-emitting diode therapy (LEDT)
NIR-I: 700900 nm
NIR-II: 10001700 nm
nm - NanoMeter - 10-9 meters - 1,000 µm (micron)
PBM - PhotoBbioModulation
TENS | UK NHS (transcutaneous electrical nerve stimulation)
Links:
Red light therapy and psuedoscience | Reddit says it doesn't go that deep.
TENS

Infrared Heating in food