They have been using them for quite a while. They started off with the SL- series (seen in the post) which were rebranded Wheelock LED3 devices. Then, they moved to the SL2 devices, which are rebranded Eluxa devices. Recently, they have released the ACEND series, which are not rebranded Wheelock devices. I would say that the SL2 devices are somewhat rare compared to the others because they were only out for a short time between when Wheelock stopped making the SL devices for Siemens and when the ACEND devices were released. My school which just opened up in August has almost all SL devices. There are only a few SL2 remote strobes that were installed in the band area (the last area to be finished).