LIGHTING DEVICE SUPPLYING TEMPORALLY APPROPRIATE LIGHT

摘要

A lighting device operable to supply temporally appropriate fight to a user comprises a fight socket adapter interposed between a primary socket and a first type of lamp. The primary socket is connected to a switchable supply of electrical power. A first type of lamp includes wavelengths below 530 nm that are suppressive of melatonin production in a user viewing the light. There is a second type of lamp that supplies fight s?bstantially all above 530 nm so as to avoid suppressing melatonin production in a user viewing the fight. The fight socket adapter has at least one mode of operation in which automatic means causes the first and second types of tamp to be exclusively operable during respective predetermined periods of time.