Patent ID: 7850720

Claim:
A portable light device for treating a subject with light comprising: a light source emitting light pulses at a plurality of predetermined intensities, repetition rates, duty cycles and durations, wherein said light source is mounted to direct said light pulses onto said subject; and; a controller for modulating the intensities, repetition rates, duty cycles and durations of said light pulses. wherein said predetermined pulse repetition rates are stepped in a series of steps between an upper pulse repetition rate chosen between around 92 kHz to around 73 kHz and a lower pulse repetition rate chosen between around 76 kHz to around 64 kHz; wherein a particular intensity between around 9000 lux to around 15,000 lux controlled by duty cycle is provided for each of said steps; and wherein, each of said steps has a duration of from around 2 minutes to around 6 minutes.