On Thu, 30 Apr 2015 22:48:40 +0000 (UTC),
(Andrew Gabriel) wrote:

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?

It's a social club. Just the usual large room with dormer type windows
and a bar at one end. It has always has quite nice low level lighting
brightening at the bar

What you have said has exactly confirmed the ideas of a sparks that is
a regular and a few others.

Many thanks for your good input.