A method of adjustment experiment was conducted in which observers matched the lightness of a test stimulus to the lightness of a reference stimulus. The reference stimulus and background were non-uniform and consisted of a blue noise pattern. The test stimulus and background were also non-uniform and consisted of a white noise pattern. In both cases, the background patterns were comprised of black and white pixels. The stimuli consisted of gray and either black or white pixels. Fourteen observers performed the experiment on a CRT in a dark surround. We found that there is an approximately 10 percent difference in the relative luminance for the matches between the white noise and blue noise conditions, and that this difference is statistically significant at a 95% confidence level. In this abstract, we discuss these non-equivalent backgrounds in relation with previous studies and also present some preliminary results for moving test stimuli.