Please tell me what this is. A light bulb shaped item, with a vacuum and revolving panels activated by light?

Question

I used to own one and think it was called a solar radio...... something? Great facinating little gadget, i would love to get another.

Answer 1

A radiometer.
... and they're still available on-line... around $10.

Answer 2

It's a "Solar Radiometer" (you were close)
It's about as cool as those thermodynamic drinking birds.