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. 2019 Mar 4;10:1020. doi: 10.1038/s41467-019-08994-5

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Recovery of broadband spectra. Measurements of a the emission spectrum of a combination of two LEDs (green and red), and b the emission spectrum of a multimode LED (orange/red). C, collimator. c, d Two different spectra appear as the same RGB color. M, mirror; F, filter; BS, beam splitter. c A light beam from a lamp (ASBN-W) is split into two beams, and recombined in a power ratio of 3:4 after passing through two different bandpass filters at 580 ± 5 nm (Thorlabs, FB580) and 640 ± 5 nm (Thorlabs, FB640), respectively. The spectrum of the recombined beam is then analyzed by the PC spectrometer. d Measurements for a white light beam (ASBN-W) passing through a bandpass filter at 590 ± 5 nm (Thorlabs, FB590). For all four cases, the measurement results using the PC spectrometer (circled lines) match well with reference spectra obtained by a commercial monochromator (red solid line)