First of all, CRI can be measured and you can buy lamps with high CRI. Secondly, sorry but even if an incandescent or halogen has high CRI, it makes everything

First of all, CRI can be measured and you can buy lamps with high CRI. Secondly, sorry but even if an incandescent or halogen has high CRI, it makes everything look yellow and consumes a lot of energy. It is much easier to make high CRI LED fixtures than to make incandescent lamps more energy-efficient.