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Newer, smaller blue and green lights hold promise for ease of use and efficacy. The light boxes use less light than full spectrum boxes and there are smaller and more portable. Some studies identify blue/green wavelengths as the "active ingredient" in effective light therapy (Terman 2007, Phelps).
Important caveats:
There is a theoretical increased risk of macular degeneration (MD) with these lights although they are generally thought to be safe (the blue wavelength used is higher than the wavelength thought to induce MD). Discuss the pros and cons of using this product with your patients before starting therapy.
Because a majority of the blue light receptors are located toward the bottom of the retina, these products should be placed slightly above (rather than at) eye level. Lights should be positioned 20" to 30" from the face.
Patients with a history of ophthalmologic problems should consult an eye care specialist before beginning treatment.
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