Up until the release of the I-Torch Symbiosis, underwater lights were divided into two types - Strobes or constant LED video lights.
The Symbiosis is a bold attempt to combine the two and create a single all-in-one light. The Symbiosis is basically a strobe, with a high-end video light mounted on the top part of it.
The name Symbiosis means interaction between two different organisms living in close physical association, typically to the advantage of both. With this, video light and strobe are now in one body.
The battery is shared between the two light elements, and the brains inside allow you to control everything through one unique and user-friendly panel on the back.
This Underwater Strobe / Video Light combo comes in two versions, the 2500 and the 4000 (purple head) lumens video light models
Strobe: