In article ,
EricP writes:
We are LED converted at home and very pleased with them but the place
my wife works have just replaced all their bulbs with Daylight LEDs

Immediately everyone working there has got terrible headaches that
last about twenty four hours. The whole staff from managers down.

Anyone get any ideas about this.

"Daylight" tends to mean high colour temperature (5500 - 6500K).

There are often two problems with this when used for artificial
lighting:

The intensity is nowhere near what your brain expects for this
colour temperature, so it looks wrong and makes colour perception
(particularly in the reds) more difficult. Raw meat preparation
is the classicly bad match for such a situation.

Some of these high colour temperature LEDs have poor colour
rendering properties. Again, if discrimination by colour (not
racial discrimination;-) is part of the job, it could be that
this is now much harder to do.

What is her job?

Another potential issue - if the lamps are dimable on regular
dimmers (even if not used in this case), many such LED lamps
flicker at 100Hz. That's not a problem normally, but if you
are looking at things which move under 100Hz strobe, it might
be.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]