Patent ID: 8378574

Claim:
A lighting system for creating a biological effect induced by light, the biological effect being a different effect than vision, and the lighting system comprising: at least one light source for generating light with a varying spectrum, and at least one driver for driving the lighting system to, successively in time: generate a first spectrum (S 1 ) during a first period in time (T 1 ), change the first spectrum (S 1 ) into a second spectrum (S 2 ) during a second period in time (T 2 ), the second spectrum (S 2 ) having the biological effect, and continue the second spectrum (S 2 ) during a third period in time (T 3 ), wherein a duration of the second period in time (T 2 ) is selected in a range from 5 seconds to 30 minutes; said light of said first spectrum having a red color and said light of said second spectrum having a blue color; said first spectrum being a wavelength of about 600 nm to about 760 nm and said second spectrum being a wavelength of about 440 nm to about 520 nm.