The present invention provides a light emitting device comprising: a light output; a light source that produces light having a wavelengths of 530 nm or less; and a wavelength transformer located between the light source and the light output, where the wavelength transformer comprises Sr.sub.1-xCa.sub.xGa.sub.2S.sub.4: yEu.sup.2+zGa.sub.2S.sub.3, where x is 0.0001 to 1, y is a value defining sufficient Eu.sup.2+ to provide luminescent emission, and z is 0.0001 to 0.2 based on the mole amount of Sr.sub.xCa.sub.1-xGa.sub.2S.sub.4, and where the wavelength transformer effectively increases the light at the light output, the light having a wavelength between 535 nm and 560 nm.