AFTQ 2400ws Quartz Flashtubes fit all of the existing Lumedyne Flash Heads with or without the modeling light feature. They also fit in the new Extra Small Heads. They can be used at low power as well and can be used up to 2,400ws as that is the upper rating of this flashtube's performance.
The Flashtubes push/pull straight in/out and they will last for tens of thousands of flashes or one face down fall onto a hard surface.
Any of the Heads can use this flashtube, however, the modeling lamp itself is separate and this flashtube does not convert a non-modeling Head to have that feature.