Reading: mv medium pressure lamp with isothermal outer bulb shape

Postby **Olav** » Fri Nov 12, 2021 4:29 pm

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.

I suspect this type was one of the first mv lamps with a phosphor.
To the admins: if this pictures are too big, please let me know.

Regards

Olav

Postby **Andy** » Fri Nov 12, 2021 6:38 pm

Thanks for uploading this Olav.

The pictures are not too big, they are nice and clear!

I have the GEC 400W MAF/V lamp but have never seen a photo of this Philips version.
I'd like to think that a some examples might survive somewhere and be found one day.

Postby **Olav** » Fri Nov 12, 2021 6:46 pm

Hello Andy,

thanks for your answer. I can well imagine that the lamps with the inscription "PHILIPS" were also manufactured by GEC.
Is that a theory too distant from me? You can measure your lamp. So we could compare something with the data in the PHILIPS catalog.

Regards

Olav

Postby **Andy** » Fri Nov 12, 2021 7:21 pm

I have a feeling that you are correct about this.
It could be an early case of 'rebranding'.
The lamp is packed away very carefully and will take me some time to get to it but when I do, I will measure it and let you know.
The picture of that lamp looks exactly the same in every way as the GEC version.