Light source system employing two light emitting devices and related projection system employing two spatial light modulators

A light source system, comprising:

• a light generating device which includes a first light emitting device generating a yellow light, a second light emitting device generating a blue light and a first control device;
• a light division system which divides the yellow light into a light in a first wavelength range and a light in a second wavelength range and outputs them along a first light path and a second light path, respectively, and which outputs the blue light along the first light path;
• a first spatial light modulator, which modulates the lights outputted along the first light path of the light division system;
• and
• a second spatial light modulator, which modulates the lights outputted along the second light path of the light division system;
• and
• wherein the first control device alternatingly turns on the first light emitting device and the second light emitting device during at least some time intervals, and simultaneously turns on the first light emitting device and the second light emitting device during at least some other time intervals, wherein the light in the first wavelength range in the first light path and the light in the second wavelength range in the second light path are always on and off at the same time.