The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 19, 2013
Filed:
May. 23, 2008
Lucas Josef Maria Schlangen, Eindhoven, NL;
Gregorius Wilhelmus Maria Kok, Eindhoven, NL;
Lucas Josef Maria Schlangen, Eindhoven, NL;
Gregorius Wilhelmus Maria Kok, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A lighting system for creating a biological effect induced by light. The biological effect is a different effect than vision. The lighting system comprises a light source () to generate light with a varying spectrum, and a driver () to drive the light source () to successively in time: (i) generate a first spectrum (S) during a first period in time (T), (ii) change the first spectrum (S) into a second spectrum (S) during a second period in time (T), wherein the second spectrum (S) has the biological effect, and (iii) maintain the second spectrum (S) during a third period in time (T). The duration of the second period in time (T) is selected in a range from 5 seconds to 30 minutes. The first spectrum (S) may not have the biological effect or may have the biological effect to a smaller extent than the second spectrum (S).