Method for achieving similar sunlight source based on multiple monochrome large-power LEDs

The invention discloses a method for achieving a similar sunlight source based on multiple monochrome large-power LEDs. The method comprises following steps: (1) constructing a target spectrum matrix for discrete points spaced with an equal internal d being 0.5-5 nm of the target spectrum in the range of 380-780 nm; (2) constructing an LED unit matrix phi(i)(lambda); (3) constructing an LED spectrum matrix phi(LED); (4) constructing a coefficient matrix K; and (5) working out the number of the LEDs for different LED types by the use of a least square method. The method is advantageous in that monochrome LED spectrum distribution characteristics are presented through a novel monochrome LED spectrum radiation model, so that the accuracy of a simulation experiment is improved; LED combinations having best simulation effects on the solar spectrum can be rapidly determined through the least square method; and the solar spectrum can be reproduced with different degrees through the change of the LED types of the combinations, similar sunlight illumination of different degrees can be achieved, and demands for different illumination scenes can be met.