Recently, advance in materials and manufacture area has resulted in the commercial availability of light emitting diode (LED) with high luminance and wide spans of the dominant wavelengths within the entire visible spectrum. Because of the narrow spectral distribution, if the kind of LEDs available is enough for the spectrum span of specific target source, it is possible to make a spectrally tunable light source that is able to provide a high fidelity spectral match to a spectral power distribution.
Con...