When copying art and for other studio work it can be important to have proper color rendering. The Sekonic Spectromaster can be used to evaluate the color quality of various light sources. Sunlight and incandecent lighting are the "holy" standards for color rendering. Other light sources including LEDs are of various qualities. RGB light sources are particularly bad when used as a source of "white light".
Here is an informative link.https://www.youtube.com/watch?v=3yrg2ZxrLdg
You are right. It is not a cheap date but one can learn a great deal about light sources and the potential problems that they can sometimes create for photography.
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