Classroom lighting, when set to high luminous (lx) and cooler correlated color temperature (CCT) conditions, can increase student focus, concentration, and oral reading fluency (Mott et al., 2012; 2014). However, when illuminance is too high and color temperature is too cool, irritating and adverse effects can occur such as visual fatigue and eyestrain (Noseda et al., 2010). We evaluated the effects of lighting enriched with blue to cyan spectral range, along with the normal industry recommended range of both CCT and lux, on reading performance. High school students were randomly assigned (within grade strata) to classrooms with LED lighting either within the normal range or blue-to-cyan wavelength. Two reading comprehension measures, an ACT practice test and an adapted assessment, were used. Students in the blue-tocyan lighting rooms scored higher on the ACT Practice Test than did the control students. Implications for using optimal lighting conditions to enhance reading are discussed.