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A sample of white dwarfs is selected from SDSS DR3 imaging data using theirreduced proper motions, based on improved proper motions from SDSS plus USNO-Bcombined data. Numerous SDSS and followup spectra (Kilic et al. 2005) are usedto quantify completeness and contamination of the sample; kinematic models areused to understand and correct for velocity-dependent selection biases. Aluminosity function is constructed covering the range 7 < M_bol < 16, and itssensitivity to various assumptions and selection limits is discussed. The whitedwarf luminosity function based on 6000 stars is remarkably smooth, and risesnearly monotonically to M_bol = 15.3. It then drops abruptly, although thesmall number of low-luminosity stars in the sample and their unknownatmospheric composition prevent quantitative conclusions about this decline.Stars are identified that may have high tangential velocities, and apreliminary luminosity function is constructed for them.Comment: Accepted for AJ (Jan 2006). 35 pages (includes 10 figures

The White Dwarf Luminosity Function from Sloan Digital Sky Survey Imaging Data