Star lanterns are like miniature star hearths. As such, they're also micro fusion reactors. they obtain hydrogen to fuse by taking in ambient water vapor and electrolytically separating the hydrogen and oxygen. They're small enough to fit in the hand, but output enough energy to power an average human household.

Missionaries bring star lanterns as gifts to newly discovered sapients.

I fixed the glass issue, a little bit. It still looks a little weird. It takes 3+ minutes for this to render, so making adjustments is time-consuming.