However, like many other therapies, in order for light energy to influence diseased state a very specific target must absorb the energy. Accordingly, researchers look at exactly what elements of a particular cell is capable of absorbing a specific wavelength. This is referred to as a cell’s or molecule’s absorption spectrum. The absorption spectrum of one cell may be unique to all other cells, enabling light therapy to stimulate an individual cell without impacting neighboring cells or tissue. Accordingly, use of well-defined light parameters represents an equally elegant solution to pharmaceutical agents to modulate a specific cells biology. Additionally, the combination of wavelengths could permit the activation of multiple photoreceptor molecules found within multiple cells to deliver a more comprehensive clinical response. This is important because a combination of pharmaceutical agents may pose substantial risk to the patient; therefore, a unilateral approach may be required.