The possibility of a spectrally tunable solar-like light source is drawing attention with the development of LEDs. We researched the market of high-power, monochromatic LEDs and established a database with 103 kinds of LED by a new model. We used the database to match the solar spectrum in the wavelength range 380–780 nm. The optimal combination maximising the fit to the solar spectral curve was obtained. The trade-off relationship between the selection of LEDs and the fit was investigated in detail. The results show that the optimal combination contains 34 types of LED with a maximum correlation index R2 of 88.67%. The value of R2 reduces to 85.06% when the number of LED types is reduced to 20, but the R2 value decreases sharply if the number of LED types is decreased to 16, with a R2 of 79.97%.
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