| Subject | English | Spanish |
| nat.sc. | spectral efficiency | eficiencia espectral |
| light. | spectral luminous efficiency of a monochromatic radiation of wavelength <.i>λ | eficiencia luminosa espectral relativa |
| el. | spectral luminous efficiency | eficiencia luminosa espectral |
| el. | spectral luminous efficiency for an individual observer | eficiencia luminosa espectral para un observador particular |