BOTH the DEFT-X and the TN31mb have a beam angle of 1.4º.
That means that the hot spots are the same size.
For the first few hundred meters...there may be some corona of use around the hotspot...but that will fall off rapidly. After the TN31mb's corona falls off, it's beam, and the DEFT-X's will have the same shaped hot spot heading the rest of the way down range.
For perspective, if I use the ONE LUX range instead of the 0.25 lux range...that would give the hot spot of both lights as the same size at ~636 meters, with the TN31 at 1 lux...and the DEFT as the same size, but brighter.
The DEFT would not drop to 1 lux until more like ~ 949 meters. At 949 meters, the Size of the TN31mb's hot spot, and the Deft's, are the same....except now the DEFT is at 1 lux...and the mb is closer to its 0.25 lux end.
That means that the hot spots are the same size.
For the first few hundred meters...there may be some corona of use around the hotspot...but that will fall off rapidly. After the TN31mb's corona falls off, it's beam, and the DEFT-X's will have the same shaped hot spot heading the rest of the way down range.
For perspective, if I use the ONE LUX range instead of the 0.25 lux range...that would give the hot spot of both lights as the same size at ~636 meters, with the TN31 at 1 lux...and the DEFT as the same size, but brighter.
The DEFT would not drop to 1 lux until more like ~ 949 meters. At 949 meters, the Size of the TN31mb's hot spot, and the Deft's, are the same....except now the DEFT is at 1 lux...and the mb is closer to its 0.25 lux end.