1960s Mazda TE40R

The TE40R is a xenon flashlamp made by the Compagnie des Lampes (France) and which integrates a compact flashtube to a side reflector bulb. Interestingly, the latter has a patterned shape front and back to ensure a good homogeneity of the projected light beam. The flash tube appears to be a 40 Ws Philips #126393 model (or similar) with a very narrow U-shaped profile (26x11 mm² luminous area) to ensure a good optical control of the emitted light. This assembly is mounted on a three-pin H3 end cap that was originally used on early vacuum valves.

This lamp is suitable for both flash and stroboscopic works. In the first mode of operation the maximum pulse energy is 40 J, which results in a peak power ranging from 16.0 to 26.7 kW depending on the applied voltage (200 to 350 V). The duration at half maximum of the luminous flash varies from 1.5 to 2.5 ms, resulting in a peak light output between 592 and 988 klm. In the strobe regime the maximum average dissipated power is 4 W at 20 Hz, corresponding to a maximum pulse energy of 200 mJ. Depending on the applied voltage the peak power ranges from 80 to 133 W, considerably lower than in the flash mode. Because of the much lower pulse energy, the lamp efficacy drops to 5 lm/W only, resulting in a flux output of 20 lm average and 400-665 lm peak.

Typical of xenon flashlamps, the TE40R emits light of near daylight quality with a high actinic light content, ideally suited for daylight-balanced color films. The emitted optical spectrum is continuous due to xenon's loosely bound valence electrons, whose energy levels are affected by free charges in the plasma. The light color temperature is usually found to vary from 5800 to about 7000 K depending on the dissipated energy density, with the CCT increasing at higher energy inputs.