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I made a mistake in the calculation (10^34 x 10^14 is 10^48, not 10^38), so it's 10^12 brighter. Nobody will survive on the lit surface of a planet.

And it would likely ignite the atmosphere, which would travel at the speed of sound to the "dark" side of the planet, yes?

So 1e6 light year radius to match the solar irradiance from purely inverse square losses? Wow.