If you are always going to conduct conference calls from the same desk, then using a light that plugs into a wall outlet makes sense. However, using a light with a rechargeable battery gives you more choices. Most modern LED panel lights for video calls include USB charging and USB power capabilities. So, you can have the best of both worlds. You can plug your light into a wall outlet that has both 110V and USB sockets, use an AC adapter, or use a power bank. When you need complete mobility use the internal battery (or power bank) for your video meetings whilst on the road.