In a projection television set including red, green and blue CRTs, and red, green and blue projection lens systems, the green projection lens system is provided with a coating or a filter having a high reflecting coefficient against light below about 520 nm and above about 570 nm in wavelength. Therefore, unnecessary light, emitted from a green light source in the green projection lens system, can be reflected by the coating of filter so that only necessary light is passed. This allows for a projection television set which contains a color reproduction range closer to the color reproduction range of a standard television set.