Smartphones are getting much better in capturing videos and photos in low light conditions. You are still going to have better results with a portable light. The Lume Cube AIR LED Light is a waterproof video light that works with your phone, action cam, and other devices.
The Lume Cube AIR has 5600K daylight color temperature. It has 400 lux brightness at 3.3′. It not only has an onboard button but also has iOS/Android control. The light has 4 brightness levels and a strobe mode.
You can control brightness, flash duration, and check battery level on your phone.