Thanks for pointing out this: I will study it. But on a first glance it may be just related to difference in emissivity of the plates (that has different surface finish after the treatment).
Yes, it may! It depends on the energy and on the nature of the emitted radiation. Chemical and chemical-physical phenomena have an energy upper limit in the order of few tens of eV. We need to characterize the radiation before we can draw conclusions.
Robert, all the point you cite have been carefully checked. I spent about one month on analysing all these issues and for this reason I started with control experiments (you can find info on previous posts) with identical setup. This was also done in order to characterise noise level, instrumental sensitivity and the general behaviour of the "dummy" device. So artifacts can be definitively ruled out. Please compare the active and control results by yourself.
I agree on additional tests. But I have I slighty lateral position on "conventinal effects": as I already wrote, I think that in the LEC there are two different effects taking place. One may actually be "conventional", and it is the one that generate the voltage, since it seems related to the employed metals (cfr. brass vs aluminium CE voltage and current). The other effect may be less conventional, and it is the one that ionizes the gas. The ionization of the gas is in my opinion the most striking phenomenon.
In order to anticipate (or to answer) some of your questions, I can say that next experiments will be done with sealed devices with air, with hydrogen instead of air, and with nickel plating instead of iron. One of the aims is to run the LEC for longer time. This is not possible right now due to the rapid oxidation of iron.
I also want to remember that there are many conventional ways of increasing the energy output of the device and to make it a useable energy source. It is only a matter of engineering. But the priority now is answering to more foundamental questions.
Regarding control experiments, I am late to this thread and need to go back and review what you have done in the controls.
But I cannot see how a control experiment could disprove that the power is from outside sources. For instance, the active experiment could be a novel way to make a diode, but the diode is not formed in the control. The diode rectifies AC fields (or acts as a solar cell) and shows apparent power generation. That still might be interesting, but it is not anomalous excess energy.