A fluorescent light gives out heat, light and X-rays, as the plasma burns the gas into pure energy
1 Na+TU+e- ->Na++2e- ->2Li++3e- ->4H++5e- ->L+X-ray+E3
So as the tube ages, it loses mass. It also forms neutrons
2 Na++e- ->Ne-+n0
So mid-life, the neutrons can make the nuclear fission carry on converting the mass into energy.
The the gas pressure drops, and the plasma is hard to initiate then impossible.
If we had a small water reservoir, the mid-life run on would carry on for ever.
So light with no external power – and we are talking about 5x10-19cc of regular water a year. We can include a UV phosphor, and grow hypotonic crops in old mine workings.
We can use such a water plasma tube to run a steam cycle, and generate infinite free power. All from the science which lights you kitchens and highways.
And no hyper toxic uranium fission. Turn water into heat and light.