About the history:

I am showing some text from a specialist book and a PHILIPS-catalog on an MV medium-pressure lamp with an isothermal bulb shape and phosphor.

Andy Oakley owns such a lamp. My wish is to see this photo here, too.



Source: PHILIPS-catalogue Australia, 50s


Source: ELECTRIC DISCHARGE LAMPS, by H. COTTON, LONDON 1946, CHAPMAN & HALL LTD.


Source: ELECTRIC DISCHARGE LAMPS, by H. COTTON, LONDON 1946, CHAPMAN & HALL LTD.


Source: ELECTRIC DISCHARGE LAMPS, by H. COTTON, LONDON 1946, CHAPMAN & HALL LTD.


Source: ELECTRIC DISCHARGE LAMPS, by H. COTTON, LONDON 1946, CHAPMAN & HALL LTD.


Source: ELECTRIC DISCHARGE LAMPS, by H. COTTON, LONDON 1946, CHAPMAN & HALL LTD.


I suspect this type was one of the first mv lamps with a phosphor.


Regards

Olav

Ah yes, the MAF/V. This is easily one of the rarest mercury lamps out there, even James Hooker doesn’t have one and his example on lamptech was borrowed from a museum. I think Andy is the only member here lucky enough to own one of these incredible lamps.




https://www.lighting-gallery.net/gallery/displayimage.php?album=6641&pos=25&pid=114881

Just when we thought our bucket list was nearing completion, along comes this gem

Thanks for uploading these extracts from documents regarding the MAF/V lamp Olav.
It is a fascinating old lamp and I believe the earliest type of mercury lamp to have a phosphor coating.
Several manufacturers produced this lamp from what I can tell although I did not know Philips made it until I first saw your 1950s Philips catalogue.
It was the kind of lucky find that is unlikely to be repeated.

As it is one of my most precious lamps, it is packed away very safely and I have not seen or lit it for a couple of years now.
I must try and take a couple of improved photos of it when I get the chance. Due to the shape and size of it, taking a good photo is a bit tricky.
Here is one of the photos I took a few years ago.

A small supplement of technical data.
The cutout is from the G.E.C. Catalog from 1951:


Source: G.E.C. Streetlighting Equipment catalog, London1951, page 85

I found a small addition to the lamp MAF/V 400W:


Source:
E.L.M.A.  ELECTRIC LAMPS, 1949, page 84 and 85,
Spottiswoode, Ballantyne Co. Ltd. London and Colchester

One of the few items on our bucket list that we still have to find. Maybe one day