초록 ▼

Lighting devices for portable and fixed applications use two or more light sources having differing spectral colors and electrical circuit parameters to shape spectral energy distributions of beams of illumination for projection upon external objects and surfaces so as to enhance an observer\s perce

Lighting devices for portable and fixed applications use two or more light sources having differing spectral colors and electrical circuit parameters to shape spectral energy distributions of beams of illumination for projection upon external objects and surfaces so as to enhance an observer\s perception and discrimination of information displayed thereon, while reducing the radiation of inefficient energies at undesired color spectra. Electrical parameters of the differing light sources are used in sensitive circuits to monitor the condition of battery power and to automatically extend the range of effective illumination produced as the applied power degrades.

대표청구항 ▼

A lighting device, supplied with electrical power, for illumination and improved color perception by an observer of external surfaces, which comprises: (a) a first subassembly comprising at least one lamp for emitting a first beam of photometric energy of a first spectral distribution and a first me

A lighting device, supplied with electrical power, for illumination and improved color perception by an observer of external surfaces, which comprises: (a) a first subassembly comprising at least one lamp for emitting a first beam of photometric energy of a first spectral distribution and a first median wavelength which remains relatively stable over a given range of said power; (b) a second subassembly comprising at least one lamp for emitting a second beam of photometric energy of a second spectral distribution with a second median wavelength which remains relatively stable over said given range of power and that differs from that of said first median wavelength; (c) means to combine and project said first and second beams of photometric energy from said lighting device such that when the composite energies are used to illuminate an external surface said composite energies are perceived by said observer as a synthesized third spectral distribution with a median wavelength differing from both said first and said second median wavelengths; and (d) means for an automatic diminishment of shifts of said median wavelength of said synthesized composite energies resulting from disproportionate changes in the photometric energies emitted by said first and second subassemblies initiated by changes in power consumed by said lighting device due to variations of said supply of electrical power by degradation and voluntary adjustments.