"Jim Lux" wrote in message
...
Based on my admittedly anecdotal data, there's a fair amount of
manufacturing variability, so unless someone is going to go out and
collect data on a statistically significant sample (which practically
means tens or hundreds of units tested), any set of measurements is valid
only for the item measured.

Well, my report is certainly anecdotal. No measurements beyond turning on
the AM radio and bringing it up close to the lights were made. However, I
can believe that perhaps the electrician got a bad batch of lights. Maybe
the ground was missing or some filter or something like that. However, it is
highly unlikely that the (good) Hera lights happened to be totally quiet due
to some manufacturing variability. In other words, manufacturing
variabilities can and frequently do result in really bad units, but rarely
result in phenomenally better units than the norm. What this tells me is
that the Heras have a better controlled manufacturing process. If that's all
you got from my post, then I submit that that is a valuable data point.

(The web site of the "bad" lights says that they are California Title 24
compliant. I have no idea what that means.)

Let's put it this way: given my merely anecdotal experience, if you had to
buy undercabinet lighting tomorrow, which would you buy? That's all you can
get from anecdotal evidence.