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Compare R G B LEDs adjusted to white, a "White" LED, high efficiency CCFL, an art CCFL, halogen light and daylight on a very large box of colouring pencils or other physical wide spectrum items, not a photo or printout (they are narrow C Y M K).
You'll be amazed.
Or use the rear of a pressed CD as diffraction splitter to make a rainbow. No gaps on halogen or daylight.
Some household LED lamps are GARBAGE at colour RENDITION, no matter what the illusion of colour TEMPERATURE is.
To not affect sleep, you need light with very little blue. Not very possible with LEDs unless a mix of yellow and blue with blue off.
Best LED lamps are some of the better "filament" style as they mix other colours of LED with the blue LEDs, they use very many LEDs at lower power (cooler) and thus the predominantly yellow phosphor is longer life and more efficient. Also they don't need a low voltage SMPSU destroying radio reception as there are 22 to 28 LEDs per "filament" and over all runs direct off 110V (or 220V twice as many "filaments") via a rectifier.
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