They appear (from their pictures on link) to be using two array at different angle to mimic the radial dispersal of a tungsten filament. With geometric placement that also looks to replicate tungsten, it seems to offer a potentially accurate reproduction. After all, various parts of tungsten filaments are often shielded to prevent light scatter in unwanted directions.
It seems reasonable to approach it from the opposite direction from a technical perspective, ie. tungsten with high radial dispersal "barn door" shuttered to control light direction with attendant losses, versus led arrangements in a "spread" array to arrive at something very close.
