Patent ID: 7894050

Claim:
An apparatus for determining intensities and peak wavelengths in one or more predetermined wavelength ranges of light, the apparatus comprising: a) one or more pairs of sensing units for sensing the light, a first sensing unit of a pair configured to sense a first intensity of the light in a first predetermined wavelength range with a first predetermined spectral responsivity and a second sensing unit of a pair configured to sense a second intensity of the light in the first predetermined wavelength range with a second predetermined spectral responsivity; and b) a processing system operatively connected to the one or more pairs of sensing units, the processing system configured to determine the intensity and peak wavelength for each of the one or more predetermined wavelength ranges of the light according to one or more predetermined functional relationships between each of the first intensity and second intensity, wherein the first predetermined spectral responsivity is substantially constant for a first portion and ramps down over the predetermined wavelength range and the second predetermined spectral responsivity ramps up over the predetermined wavelength range to a substantially constant level.