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An 400W probestart MH lamp, under the Osram Powerarc brand name, in a shop in Nesher center
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I don't have much information about these lamps. But i bet that they aren't from Osram, if they are still producted today.
They aren't suitable for operation in Europe, since they can be operated only on CWA (M57) ballasts and not by any type of european HID reactor ballast for 400W lamps.
However, this lamp actually have an E40 base and not a Mogul base.
In this picture, this lamp operates by an Eltam M57 CWA ballast for american probestart MH lamps.
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However i think that this lamp in this picture operates by a CWA ballast of Eltam or by a MH ballast with a semiparallel ignitor, since i don't think that they reading the instructions of the lamps.
dor123 yes they are the same as the European Powerstar HQI/NSI lamps but they have Coated BT Bulbs and Clear ED18 Bulbs, today in the USA they are the Same as the Metalarc MH Lamps.