PROJECTION LIGHT PATH AND PROJECTION APPARATUS

Disclosed are a projection optical path and a projection device. The projection optical path comprises: a main optical path (1), which comprises a first light source (10) emitting a light with a first wavelength; and an auxiliary optical path (2), which comprises a second light source (20) emitting a light with a second wavelength, a third light source (30) emitting a light with a third wavelength, and a fourth light source (40) emitting a light with a fourth wavelength, wherein the light with the second wavelength, the light with the third wavelength and the light with the fourth wavelength are sequentially converged into the light with the first wavelength, wherein the light with the first wavelength, the light with the second wavelength and the light with the third wavelength are one of red light, green light, and blue light, respectively, wherein a wavelength range of the light with the fourth wavelength is within a wavelength range of the red light, and a wavelength of the light with the fourth wavelength is defined as λ1, and a wavelength of the red light among the light with the first wavelength, the light with the second wavelength and the light with the third wavelength is defined as X2, andλ1≠λ2; and an excitation light source (50) emitting an excitation light, wherein the excitation light is emitted to the first light source (10) or the second light source (20). The projection light path can not only reduce the red light thermal effect, but also improve the light emitting efficiency of the light source, such that the overall brightness of the protection screen is effectively improved.