Power Output and Dosing

Looking at some of the Power Outputs being claimed by various manufacturers of LED Red Light Therapy Units, it’s obvious that there are a lot of inaccurate claims being made.  Most Vendors publish their units Power Consumption numbers (instead of their Power Output in mW/cm2) which not only are misleading high, but totally irrelevant in terms of dosing.

Other Vendors typically measure their units Power Output at the Emitter surface (right up against the actual LED), to claim numbers about 3x higher than the actual output thru their optical system. Considering the lights are not used without their optics in place, those numbers would be useless to calculate dosing.

In an effort to avoid hype and provide accurate, reality based numbers to calculate dosing, we measured or Photopuncture Torch with and without the Fiber-Optic Probe attachment (on the HIGH mode) for actual Power Output (Energy Density) in mW/cm2 at various settings and distances with a Tenmars Power Meter. We also measured 3 other popular torches for comparison purposes.  The Photopuncture Torch’s Power Output for Low mode is 33% of High mode.

Many large NIH Studies reflect a practical and effective range for Energy Densities of between 20 mW/cm2 and 310 mW/cm2.

Power Output/ Energy Density mW/cm2

Actual “real world” Energy Densities after exiting optics is about 30% of that at Emitter Surface. Use that # for dosing calculations

At LED Emitter Surface mW/cm2 Exiting Optics mW/cm2
PTI Photopuncture 660 nm Red Torch 1,000 PTI Photopuncture Torch 310
PTI Photopuncture 660 nm Red Torch w/ Fiber-Optic Probe 1,000 PTI Photopuncture Torch 750
PTI Photopuncture 470 nm Blue Torch 800 PTI Photopuncture Torch 285
PTI Photopuncture 470 nm Blue Torch w/ Fiber-Optic Probe 800 PTI Photopuncture Torch 470
Photonic Health Pro-Gen II n/a Photonic Health Pro-Gen II 295
Tendlite 660 Tendlite 200
Aah Light 550 Aah Light 164

Calculate Dose in J/cm2 for Photopuncture Torch at “0” Distance (directly touching Treatment Area)

At “0” Distance, Photopuncture Torch Energy Density = 310 mW/cm2

310 mW/cm2 = .31 W Multiply by exposure in seconds for dose in J/cm2
Ex: .31 W x 15 secs = 4.65 J/cm2 Dose


Calculate Dosage for Photopuncture Torch at other distances from Treatment Area

at 1″ Distance = 2 1/4″ Beam Width Energy Density = 50 mW/cm2
2″ Distance = 3 1/2″ Beam Width Energy Density = 20 mW/cm2

50 mW/cm2 = .05 W Multiply by exposure in seconds for dose in J/cm2
Ex: .05 W x 90 secs = 4.5 J/cm2 Dose
.02 W x 200 secs = 4 J/cm2 Dose


The Photopuncture Torch also has a “Zoom” feature.

At the Maximum zoom setting you can use the following Energy Densities to calculate Dosage:
Photopuncture Torch beamat 4″ Distance = 1 1/4″ Beam Width Energy Density = 66 mW/cm2
3″ Distance = 1 1/8″ Beam Width Energy Density = 67 mW/cm2
2″ Distance = 1″ Beam Width Energy Density = 70 mW/cm2
1″ Distance = 1″ Beam Width Energy Density = 75 mW/cm2

Example: 2″ Distance (Max Zoom) Energy Density = 70 mW/cm2 = .07W
.07 W x 60 secs = 4.2 J/cm2 Dose