On Tue, 26 Mar 2013 05:57:04 +0000, Mike Tomlinson
wrote:

As others have said, the spectrum isn't wonderful. In a hotel room lit
by LED light recently I thought the light quality was very good - close
enough to halogen for me to have a squint at the fitting to see what was
there - but when I took out my vitamin C tablets, which are bright
orange in natural light, they were very washed out under LED light.

It made me think that some interestingly-coloured food could come out of
kitchens lit by LED.

They are actually blue LEDs with a bit of white phosphor on the end.
The more phosphor you put in you get the less of the blue and the more
white it looks but they get dimmer. A warm white would give nore
natural colours than a cool one.