The MacBook fared better on the color accuracy test, notching a Delta-E rating of 2.5 (closer to 0 is better). The Acer Aspire S7, by contrast, hit 98 percent. However, the HP Spectre 13t mustered just 231 nits.Īccording to our colorimeter, the 13-inch Air produces 63.3 percent of the color gamut (closer to 100 percent is better). The Dell XPS 13, for instance, averaged 356 nits. Click to EnlargeThe screen's average brightness of 288 nits outshines the average ultraportable (251 nits) but is not the best in class.