Re: in case you missed it
Actually, it's the equivalent of about 58 million 100 watt lightbulbs. Which, for the record, is approximately .0000034 percent of the amount of wattage that hits the Earth from the Sun, given a solar flux of approximately 1.7 x 10^17 watts. Feel free to check my math.
That's given the assumption of some possible connection between the amount of uranium mined and the heat emission characteristics of pure radium. And that's assuming your numbers for radium are correct.