You're likely describing tubular daylighting devices (TDDs), also sometimes called solar tubes or sun tunnels. While they might look like LED or fluorescent fixtures, they use no electricity to bring natural light into a building. They are a fantastic lighting solution for areas with limited or no windows, and they're often popular in Amish communities due to their energy-efficient nature and ability to operate without electricity.Here's why they seem like what you saw and some key features: Non-Electric

TDDs capture sunlight through a dome on the roof and redirect it down a reflective tube into the interior space.

Bright, Even Light

The reflective material inside the tube is exceptionally efficient, maximizing the amount of light transferred. The diffuser at the end of the tube (the lens you saw with the crystals) spreads the light evenly throughout the room, giving the appearance of a standard electric light fixture.

Cloudy Day Performance

TDDs work even on cloudy days. While they won't be as bright as on a sunny day, they still gather ambient light and significantly improve the illumination compared to relying solely on electric lights.

"Crystals" or Lens

The "crystals" you saw on the diffuser are designed to scatter the light and prevent glare. These are usually prismatic or faceted structures that refract and diffuse the light, creating a soft, natural illumination that is pleasing to the eye.

Why they're popular in Amish communities



Energy Independence

A significant benefit for Amish communities is that these do not require electricity.

Natural Light

Natural light is better for eye strain and is known to increase productivity.*

Long Lasting: Once these are installed, they should last for many years. Flag for review