And there it is: the Astrolux S42. Choice of XP-G2, XP-G3 or 219C 5000K. Both tube lengths included. Initial price of $30. The firmware looks to be a translation of A6 to e-switch, which is less than optimal, but not the worst thing they could have done.
Would be cool if I could get in touch with the people who made this, to have a chat about source code and how the GPL works. I don’t know if it’s actually based on any GPL’d code, but it’d be nice to have the sources anyway.