Abstract: An apparatus for generating a spectral distribution. This apparatus contains a light source and a single filter. The single filter is comprised of a color correcting filter material and a neutral density filter material. When the apparatus is adjusted, the spectral distribution of the light which passes through it varies continuously, but the brightness and/or irradiance of such light is substantially constant.
Abstract: An apparatus for providing a light distribution which can simulate any desired lighting condition such as, for example, daylight, blackbody radiation, and the like. The apparatus contains a lighting source which provides polychromatic light. The polychromatic light is then dispersed into its constituent frequencies, the dispersed light is then selectively attenuated, and the selectively attenuated light is then converted into light composed of randomized spectral frequencies.
Abstract: An apparatus for producing spectrally different light distributions which have the same irradiance is disclosed. This apparatus contains a light source and an adjustable, opto-mechanical filter means. The filter means contains an adjustment means for simultaneously varying the spectral distribution of light passing through the filter while maintaining the flux of the light at a substantially constant irradiance level.