On Thursday, 30 April 2015 23:06:47 UTC+1, 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.

Any nasty vapours being given off by the lights or the power supplies? Varnish on circuit boards overheating?

Anything in the building been disturbed? EG Could there be a leaky boiler flue above a ceiling, which has been disturbed to install the lights, and CO is now getting into the workplace?

Owain