This is a comment on a previous Letter [Opt. Lett. 35, 3372 (2010)]. The chromaticity coordinates of nanocrystal quantum dot (NQD)-integrated WLED1, WLED2, and WLED3 are out of the range of the chromaticity tolerance quadrangles of white light sources. So these NQD WLEDs do not satisfy the requirements recommended for general lighting with solid-state lighting products to ensure high-quality white light. Furthermore, correlated color temperatures of WLED2 and WLED3 should be 2682 and $2527\mathrm{K}$ , respectively, according to the chromaticity coordinates of WLED2 and WLED3 at $12\mathrm{mA}$ , not 2781 and $2390\mathrm{K}$ . The NQD-integrated WLED1 and WLED2 located in tolerance quadrangles are simulated by the changing spectral power of green-, yellow-, and orange-emitting NQDs. The simulation results are presented.