A lower colour rendering index for lamps often results in a higher luminous efficacy and vice versa. In high halls, lamps with elevated luminous efficacy, e.g. high-intensity discharge sodium vapour lamps, are often used for economic reasons. These, however, only have a colour rendering index between 40 and 60 (see also chapter 22.214.171.124 "Light source, luminous efficacy").
When using LED luminaires, this problem can be mostly avoided. They are available with good colour rendering and simultaneous high luminous efficacy. High efficiency as in addition to lower maintenance requirements also make them economically attractive.