A stereoscopic digital projection system for projecting a stereoscopic image including a left-eye image and a right-eye image, comprising: first and second spectrally-adjacent light sources providing corresponding first and second light beams, the spectrally-adjacent light sources having corresponding first and second spectrally-adjacent, substantially non-overlapping spectral bands, both spectral bands falling within either a red color spectrum, a green color spectrum or a blue color spectrum; a spatial light modulator having an array of pixels that can be modulated according to image data to provide imaging light; illumination optics arranged to receive the first light beam from the first spectrally-adjacent light source and provide a substantially uniform first band of light, and to receive the second light beam from the second spectrally-adjacent light source and provide a substantially uniform second band of light; beam scanning optics arranged to cyclically scroll the first and second bands of light across the spatial light modulator such that the first and second bands of light are substantially spatially non-overlapping; a controller system that synchronously modulates the spatial light modulator pixels according to image data for the stereoscopic image, wherein the spatial light modulator pixels illuminated by the first band of light are modulated according to image data for the left-eye image and the spatial light modulator pixels illuminated by the second band of light are modulated according to image data for the right-eye image; projection optics for delivering the imaging light from the spatial light modulator to a display surface; and filter glasses for a viewer having left-eye and right-eye filters that selectively transmit light in the first spectral band to the viewer's left eye and selectively transmit light in the second spectral band to the viewer's right eye. first and second spectrally-adjacent light sources providing corresponding first and second light beams, the spectrally-adjacent light sources having corresponding first and second spectrally-adjacent, substantially non-overlapping spectral bands, both spectral bands falling within either a red color spectrum, a green color spectrum or a blue color spectrum; a spatial light modulator having an array of pixels that can be modulated according to image data to provide imaging light; illumination optics arranged to receive the first light beam from the first spectrally-adjacent light source and provide a substantially uniform first band of light, and to receive the second light beam from the second spectrally-adjacent light source and provide a substantially uniform second band of light; beam scanning optics arranged to cyclically scroll the first and second bands of light across the spatial light modulator such that the first and second bands of light are substantially spatially non-overlapping; a controller system that synchronously modulates the spatial light modulator pixels according to image data for the stereoscopic image, wherein the spatial light modulator pixels illuminated by the first band of light are modulated according to image data for the left-eye image and the spatial light modulator pixels illuminated by the second band of light are modulated according to image data for the right-eye image; projection optics for delivering the imaging light from the spatial light modulator to a display surface; and filter glasses for a viewer having left-eye and right-eye filters that selectively transmit light in the first spectral band to the viewer's left eye and selectively transmit light in the second spectral band to the viewer's right eye.