Oldgoat, regarding your experience,
"Probably not I worked on ABC transmitters for years (50 Kw-612Kcs) doesn seem to have affected me at all and none of my old workmates have been afflicted by brain tumours so far. Lots of other things but I don't think HF radio caused arthritis or any of my other ailments."
620KHz is not a microwave...not even in the far neighborhood. I personally worked with one of the most brilliant software engineers I ever met who had been a Navy radar tech, as had his brother. Both died leaving young children fatherless from aggressive brain tumor, and his last couple years after surgery and radiation where a horror story.
The incidence of brain tumors from cell phone use is very slow in developing, a moderate increase and is only one small part of the health risk. The effects on cell wall ion transport, for example, will more likely show up systemically as an increase in general health problems - the specifics determined by your family genetics. The effects on blood brain barrier may result in increased tendency for neurological impairment and degenerative diseases. The same is true for toxic exposures...you get to watch as every health problem in your family tree plays out, most being what are now known as chronic autoimmune diseases. So it is likely that arthritis, heart disease and any other common autoimmune diseases in your family tree will be activated by continued EMF exposure. Building/home wiring EMI, when bad, is also thought by some to be a pretty strong cancer growth stimulant and has been linked to some school cancer clusters by Milham (epidemiologist MD).
The genetics and epigenetics lottery is such that it is easy to find someone who has, for example, smoked 3 packs of cigarettes a day for 70 years and died at 90 in his sleep. This sort of occurrence has not a lot to do with public health and yet kept a lot of people smoking and dying horrible deaths for many years.
The biggest payoff is for reducing EMF exposures (EMI, ELF magnetic fields, and radio/microwave) in the bedroom, where your "CPU" rests and recovers each night. EMI on home wiring is easily located via AM radio (the old Radio Shack 12-467 or Sony ICF-S10MK2) and flipping off circuit breakers to locate the offender, and one meter by Cornet does the other two fairly well. Reducing your night time EMF exposure is the best bargain in health insurance around. The most common problems are easily solved and are within the realm of the handy DIY'er.
Bravo on your roof hookup, Glort. I have the same problem with spacial planning now- have to built it 3 times to get it right, can't foresee the problems. I resort to mock ups when I can, but that only reduces the first round of revision.
Regarding your dislike of fluorescent lights; likely possibilities include light spectrum and EMF.
The light spectrum is very unnatural, big spikes at some colors, nothing like natural light or incandescent or halogen which is full and broad in spectrum.
https://www.comsol.com/blogs/calculating-the-emission-spectra-from-common-light-sources/LED lights are also fluorescent lights (dab of phosphor over a UV LED) with the same problem.
EMFs:
Fluorescent lights are now typically driven with a 100KHz high voltage square wave; an arc is started and topped through the mercury vapor at that rate. The emissions of an arc are broad spectrum, so we have a 100KHz pulsed broadband emission. It is a tremendous source of radiating emissions, both directly and from the attached wiring. The older transfomer type ballast lamps had the broad spectrum EMI pulses at 60Hz. You can confirm this with the aforementioned AM radio held near the lamps. The idea that we expect young school children sit under these all day, and then give them methamphetamine when they can't stand it, makes me angry.
I think parents should be screaming at their school boards for daylighting of classrooms, and pulling out wireless from schools. Karl Riley's work on school EMFs is worth a good look as well.