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. 

Which is brighter, the automative lighting or IMALENT MS18? Do you have more wonderful video of IMALENT flashlight ? Comment with your answer!

In this video I see how fast we can get a radiometer to spin by shining the world's brightest flashlight on it. Then I talk about the real reason the Crookes radiometer spins when you shine light on it. I talk about thermal transpiration and how it works. Flashlight Imalent MS18: https://www.imalentstore.com/products/imalent-ms18-100000-lumen-flashlight