Well, StarHalo's description :grinser2: is pretty correct, there is no "producer"/"Brand"/whatever ... You search for.
brightness ... :thinking:
the claim is possible.
If You give us the led that is used (picture from the front end) and the current measured at the battery, or the runtime, then this can be roughly calculated.
If that thing gets HOT within some mins of use, then there is a high chance that the led really sees enough power to give that brightness (at least almost it)