From NightHawkInLight:

In this video I build a bat signal from a lensed flashlight beam. This design can be used to project any image, or simply act as a spotlight. For the light source I’m using the Imalent MS18 flashlight.

Similar fresnel lenses as the one I used in this video are available on eBay. I used a lens 250mm in diameter with a 500mm focal length.

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[NightHawkInLight | Imalent MS18 flashlight]