Both laser (Light Amplification by Stimulated Emission of Radiation) and LED (Light Emitting Diode) therapies (such as those used in Photizo red and infrared light therapy devices) rely on being able to deliver an adequate amount of energy to the target tissue in order to precipitate a photochemical process known as photobiomodulation (PBM). Both fill unique roles in the world of complementary medicine. Both have important applications. Both can provide effective, powerful healing light.
Many therapeutic devices use red and/or infrared light, due to their healing properties. Specifically, the 633 nm red wavelength is ideal for stimulating mitochondrial function for healing and detox, and the 850 nm infrared wavelength is ideal for deep penetration into muscles and tissues to promote blood flow and bring relief.
Coherent vs incoherent light
Coherent laser light concentrates its power in a small point, which makes it ideal for stimulating a small area, such as an acupuncture point. LEDs, on the other hand, tend to distribute their power over a larger area, but without the travelling effect of laser. Therefore, LED effects tend to remain local, affecting the local tissues that are exposed to the light. And because LEDs are diffuse, they tend to cover a much larger area than the pinpoint of laser light.
Safety for eyes
All lasers produce coherent (concentrated) light, and depending on the power of the laser, irreversible retinal burns can result. Although some lasers are relatively eye safe, there is always a certain degree of risk. That’s why it’s often recommended to use laser safety glasses when treating with laser.
On the other hand, the light produced by LEDs, being incoherent (widespread), does not pose any risk to the eyes. Safety glasses are not needed. This makes LEDs an excellent choice for treating not only adults but children and animals as well, and for diffuse treatment over large areas.
Affordability
It is generally accepted that LED light therapy devices are far more affordable than laser therapy devices, making them a great option for budget-conscious consumers.
Reliability
“The LED is a more reliable and robust device than a semiconductor laser. This is because it uses far lower current densities and lower optical power densities that are far from the stress limits of the materials. The operating device junction temperature is a critical consideration for device lifetime. A few extra degrees can reduce the lifetime by an order of magnitude.” (Source: http://www.plaintree.com/pdf/Plaintree’s%20LED%20vs%20Laser.PDF )
