Photon LED units do not come with a power lead as standard, this needs to be purchased separately. It is worthy of note that this UK power lead is 50cm long so the additional 2m extension cable will probably be required.
The 2m extension cable is useful if you wish to connect together two modules (or clusters of modules) and wish to have them some distance apart but drawing from a single power socket. They are also pretty much essential if don’t have a power supply with 50cm of where the unit is to be positioned.
The Photon support bracket is used to add stability to Photon LED arrangements of 2 or more modules. Especially advisable with 4 or more modules.