On Thu, 30 Apr 2015 23:06:35 +0100, EricP
wrote:

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.

(No dimmers are involved only on/off switches.)

Just found this:

The Workplace (Health, Safety and Welfare) Regulations 1992:
Regulation 8 requires every workplace to have suitable and sufficient
lighting. The lighting in the workplace, should as far as is possible,
be natural.

and this:

The Management of Health and Safety at Work Regulations 1999
place a duty on employers and self-employed people to assess risks
to health and safety from their undertaking. This will include risks
from lighting.

- Mike