Of course I can expand a little bit . Those (S-)HPV induction lamps are compact prototypes that were developed at Philips during the 1990s following the successful commercial release of standard integrated compact fluorescent lamps. Since the XL, an early induction lamp platform developed during the 1980s, lost out to the SL and PLCE, the focus then shifted towards more compact energy-saving lamps and the induction technology could address that more easily than conventional (electroded) fluorescent tubes. The problem, however, is that the high cost of RF drivers (2.57 MHz in the present case) eventually caused the demise of the HPV concept.

Many thanks for the information

I can also add that there was three variants of the HPV. The present one uses some components, such as the plastic base with integrated end cap, borrowed from CFL-i lamps. Also, the discharge bulb is flattened to keep the lamp length as short as possible. It is also interesting to note that the bulb is internally coated with a conducting layer of fluorine doped tin oxide which acts as a Faraday cage so as to reduce the RF electric field emission.

Interesting information, thanks.!

No problem. This is certainly a rare lamp, so it's good to share details about it.