Q. Who has studied Photonic Light Therapy?
A. The following is a sample list of scientific institutions that have
conducted clinical studies on the efficacy of Photonic Light Therapy
Palo Alto, California
Massachusetts General Hospital,
University of British
Cancer Centre, Queen’s University, Kingston,
Hospital, Physiotherapy Department, Herston, Queensland,
Department of Vascular Surgery, Dublin,
Institute of Anesthesiology
and Intensive Care, University of Padua and Associazione Italiana per la Ricercae, l’
Aggiornamento Scientifico, Padua,
Q: What is the
Difference between LED’s and LASERS?
Light Emitting Diodes (LEDs) are another form of light therapy that is a
relatively recent development of the laser industry. LEDs are similar to lasers
inasmuch as they have the same healing effects but differ in the way that the
light energy is delivered. A significant difference between lasers and LEDs is
the power output. The peak power output of LEDs is measured in milliwatts,
while that of lasers is measured in watts. However, this difference when
considered alone is misleading, since the most critical factor that determines
the amount of energy delivered is the duty cycle of the device.
LED devices usually have a 50% duty cycle. That is, the LED pulse is
"on" for 0.5 seconds and "off" for 0.5 seconds versus the 2
ten-millionths of a second burst from laser at 1 cycle per second (1hz).
Moreover, LED is "on" 50% of the time and "off" 50% of the
time regardless of what frequency setting (pulses per second) is used.
In the majority of lasers on the market, the energy output varies with the
frequency setting: the lower the frequency, the lower the output. In the
Omnilight system on the contrary, the output is constant regardless of
frequency. Even in the case of lasers that claim a peak output of 10 watts,
because of the very short duty cycle, the average output at the highest
frequencies is of the order of about 10 milliwatts. At the lower frequencies,
however, the average output plummets into the range of microwatts (1 microwatt
= 1000th of 1 milliwatt).
LEDs do not deliver enough power to damage the tissue,
but they do deliver enough energy to stimulate a response from the body to heal
itself. With a low peak power output but high duty cycle, the LEDs provide a
much gentler delivery of the same healing wavelengths of light as does the
laser but at a substantially greater energy output. For this reason, LEDs do
not have the same risk of accidental eye damage that lasers do.
Moreover, LEDs are neither coherent nor collimated and they generate a broader
band of wavelengths than do the single-wavelength laser. Non-collimation and
the wide-angle diffusion of the LED confers upon it a greater ease of
application, since light emissions are thereby able to penetrate a broader surface
area. Moreover, the multiplicity of wavelengths in the LED, contrary to the
single-wavelength laser, may enable it to affect a broader range of tissue
types and produce a wider range of photochemical reactions in the tissue.
If LED light disperses over a greater surface area, it results in a faster
treatment time for a given area than laser. The primary reason that Omnilight
chose the LEDs over lasers is that LEDs are safer, more cost effective, provide
a gentle but effective delivery of light and a greater energy output per unit
of surface area in a given time duration. They are offered in combinations of
visible red light at 660nm and infrared light at from 830nm to 930nm, with
880nm as their average.
Q. What is
phototherapy or photon therapy?
Light therapy has also been given the name "photonic" and is
sometimes also referred to as photontherapy, photodynamic therapy and LED light
therapy. A study done by the Mayo Clinic in 1989
suggests that the results of light therapy are a direct effect of light itself,
generated at specific wavelengths, and are not necessarily a function of the
characteristics of coherency and polarization associated with lasers. In
a study entitled Low-Energy Laser Therapy: Controversies and New Research
Findings, Jeffrey R. Basford, M.D. of the Mayo Clinic¹s Department of Physical
Medicine and Rehabilitation, suggests that the coherent aspect of laser may not
be the source of its therapeutic effect. He states
"firstly, the stimulating effects (from therapeutic light) are reported
following irradiation with non-laser sources and secondly, tissue scattering,
as well as fiber optic delivery systems used in many experiments rapidly
degrade coherency . . . Thus any effects produced by low-energy lasers may be
due to the effects of light in general and not to the unique properties of lasers.