Past research presented at the 1991 Beltwide Conferences indicated that near-infrared reflectance spectroscopy measures cotton fiber maturity (wall thickness) and fineness (perimeter) with precision equal to the laboratory error of the primary method used to calibrate the NIR instrument. The spectrophotometer utilized was a scanning monochromator (assay time about 30 seconds). The current study extended the useful applications of reflectance spectroscopy by using this technology to measure additional properties which included HVI upper half mean length, strength (tenacity), and micronaire, as well as the color measures of RD and +b. Visible (Vis) and near infrared (NIR) spectra were produced on each of 185 cottons to determine if extending the spectral range to the visible region improved the measurement precision when applied to these properties. Spectral data were also obtained on a high speed diodearray spectrophotometer (assay time less than five seconds) to determine the precision of a fast Vis/NIR instrument. Principal component regression was applied to the Vis spectra, the NIR spectra, and combinations of Vis/NIR spectra to determine which spectral region(s) and data processing algorithms produced optimum results. The statistical analyses indicated that combinations of principal components calculated independently from each spectral region obtained on the scanning instrument came close to matching the precision of the reference methods. The standard errors of prediction were found to be as follows: upper half mean, 0.030; strength, 1.446; micronaire, 0.069; RD, 0.442; and+b, 0.172. Improvement in these values was obtained if the four Pima cottons contained among the set of 185 cottons were removed from all analyses. The high speed diode-array instrument yielded results which, although not quite as precise as the monochromator, indicated the- potential of this instrument on a high speed line. In conclusion, initial results indicated the potential of Vis/NIR spectroscopy to match the precision of current measurement methods on length, strength, and color.