Luminous Rating 

The "luminous rating" of a torch refers to its brightness level or the amount of light output it produces. It is typically measured in Lumens.  

Typically, the more powerful the light, the greater the light output and the beam distance. Select a light that will cover the distance needed to illuminate the object to be seen. Please be sure to check the runtime is sufficient for your needs at the distant required. For example, a 5400 Lumen site light may have a beam distance of 50m for 2 hours. However, if the brightness setting was reduced from High to Medium to increase the runtime from 2 to 4 hours, then the beam distance will also be reduced from 50m to 40m.