Published by Philips in 1965 documentation, the sensor for this circuit is a common LDR. The transistors are general-purpose types from the time, only TR3 is a power type according to the load.
ON Semiconductor NTMJS1D5N04C 40V Industrial MOSFET Available from Mouser Electronics, these ON...
We found this circuit in a publication by General Electric in the 1980s. The transistors and the...
This xenon lamp circuit, also a stroboscope, was found in the May 1996 issue of Electronics Now...