These things here?.

If there're seemingly causing you wi-fi problems then I'd look elsewhere
for the cause of that problem as they work at very low power around the
868 MHz band waay below that used for wi-fi applications....


http://www.telensa.com/systems-produ...s-and-modules/

Scroll down a bit..

3rd harmonics? How does low power equate to distance operation?

Nope, the people who designed and built that system know exactly what
there're doing!. There're a spin off of this one who if you look at
their client list you'll see there very highly regarded..

http://www.plextek.com/about-us/clients.html

http://www.plextek.com/about-us/linked-companies.html

They use very ultra narrowband techniques for that a bit of which I
think is patented..

I'd like to see a spectrum analysis of the complete lamp/wireless
assembly. The word "dimmable" on a discharge lamp does not inspire
confidence.

I doubt that anything EMC related would be missed by the above firms
involved in that. They have some -very- comprehensive testing
facilities...

--
Tony Sayer