LAMOST DR1 totally releases 2,204,860 spectra, include 717,660 objects of the pilot survey (2011-10-24~2012-06-30), and 1,487,200 objects of the regular survey (2012-09-28~2013-06-30). DR1 includes two types of data: optical spectra (flux- and wavelength-calibrated, sky-subtracted), and catalog data, which includes both parameters measure from spectra, such as redshifts and signal to noise ratios, and parameters inherited from input catalogs. You should keep in mind that LAMOST is a spectral survey telescope, and the parameters related to photometry, which you get here, all come from other surveys.
