The 4x4' reflector or "Shiny Board" is a "go to" production tool for throwing lots of light.
The board can mount directly into any light stand that has a junior receiver or baby pin.
In full sunlight the reflector can easily throw as much light as any high powered HMI or daylight lamp.
The reflector typically has an angled light pattern that is more difficult to control.
The Matthboard Reflector is a more affordable option than the standard heavier reflectors seen on sets.