A further modifier is referred to as a grid or honeycomb. Such a grid causes the light to go from the source in straight lines, concentrating the light even more, giving the photographer even more control over the light.
In my example I have use a commercially produced snoot which I have fitted onto the Speedlite as in this lighting diagram:
|Snoot, ISO 100, f/22, 1/125 sec|
|Snoot + grid, ISO 100, f/22, 1/125 sec|