But which parameters should you be looking at? Johnson explained that experts agree on five parameters that define a phototherapy device: power and energy density, wavelength, diode construction, frequency and safety classification.

Johnson explained, "The output of power will be, by far, the most talked-about parameter. Sales representatives will continually discuss and debate the device's power as if it was the sole factor of consideration. While the power is extremely important, its impact determines treatment time needed to deliver an adequate dosage at the target. Laser, like ultrasound, can stimulate at low levels. At higher levels, it becomes destructive.

"Mean output of power is the most common measure of the device's power. However, peak power and energy density need to be taken into consideration. Peak power is a measure of the device's maximum output and affects not only overall photon density, but also the absolute depth. Devices that have similar mean outputs of power may vary greatly on peak pulse powers."

Curtis Turchin, DC, president of Apollo PT (www.apollopt.com), based in Redwood City, Calif., focused in on laser therapy power as the most important parameter. He likened it to a classic fairy tale we all remember from childhood.

"When choosing the right laser for your practice it is important to remember the tale of Goldilocks and the Three Bears. You want a laser that is not too hot and not too cold. If it is too cold, the power is too low and the effectiveness will be limited. If it is too hot, there is a risk of burns and eye damage."

Of course, the type of treatments you intend to use the laser for will also dictate which one you select. Turchin explained, "If you primarily treat back pain, neck pain, sports injuries, wounds and large animals [for a veterinary practice], purchase an infrared laser If you treat acupuncture points or practice auriculotherapy, consider purchasing a point probe. The most common point probes for this purpose emit 200 mW to 500 mW, which is ideal for treating small points in the ear, acupoints, for delicate extremity work, or inside the mouth."

Looking Forward

So now you have purchased a brand new laser therapy system. You understand what a laser can do for you. Now, as Harrington notes, the other half of the equation comes into play. In short, if you aren't sure what that little red button does, will the company be able to help you sort it out? Harrington stated, "Find a company that knows your profession. Yes it is important to have a quality piece of laser therapy equipment, but there is much more to it than just the equipment. Does the company offer education and training? Do they have multiple channels to offer you clinical support? Who is giving the support? Is it someone who has been in practice just like you? Does the company offer multiple avenues of marketing support?"

Ultimately, as our experts all noted, selecting the right laser therapy equipment comes down to what sort of treatments you intend to perform. The key is to make sure you understand what you are getting for your investment in the future of health care. As Harrington explained, "Laser therapy is an exciting, progressive modality which can invigorate your practice and dramatically increase your patient satisfaction levels. Adding laser therapy to your practice can be a substantial investment. Is your laser prepared to meet the challenges of the future? Wouldn't it be a tragedy if you spent a lot of money on a laser today, and five years down the road it did nothing more for you?"