Basically, ‘white LEDs’ are not really white at all, and those CFL’s come in various ‘flavors’.
Imagine a device where you could compare an LED with the room lighting,
or with sunlight. Where you can put a specific Pantone color swatch into a slot,
and see how it looks different under different lighting. This Comparative Colorimeter
is what Josef Albers would use if he taught his class on color in the present ‘age of solid state lighting’.