This page shows the different variations of the Lampa Fresnela from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free. Icons are available in PNG and vector.
The icon looks like a cardboard box, with the flaps open, if the viewer were standing directly above it. framing the upper side of the box is a semi rectangular line. Inside the box are centered two circles, one inside the other.