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Osram Na 45W-1 SOI/H New old stock SOI/H lamp. Looks Philips made. This second generation sodium vapour lamp succeeds the earlier lamps with separate dewar vacuum jacket. The lamp uses a second inner glass envelope to try and reflect some of the heat back into the discharge tube to improve lamp efficiency. SOI/H was replaced by SOX/H lamps in the mid 1970's that uses an infra-red reflective coating on the outer jacket. 1700k 6000h 3250lm MFD June 1962

Osram Na 45W-1 SOI/H

New old stock SOI/H lamp. Looks Philips made.

This second generation sodium vapour lamp succeeds the earlier lamps with separate dewar vacuum jacket.
The lamp uses a second inner glass envelope to try and reflect some of the heat back into the discharge tube to improve lamp efficiency.
SOI/H was replaced by SOX/H lamps in the mid 1970's that uses an infra-red reflective coating on the outer jacket.

1700k
6000h
3250lm

MFD June 1962

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Filename:387A4896.JPG
Album name:FrontSideBus / HID: Low-Pressure Sodium
Filesize:3984 KiB
Date added:03 Jun, 2019
Dimensions:3072 x 2048 pixels
Displayed:734 times
URL:http://80.229.24.59:9232/gallery/displayimage.php?pid=11640
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Danny   [03 Jun, 2019 at 09:33 PM]
Lovely. I lit my one a few days back. One of the best low pressure sodium lamps i bought
FrontSideBus   [05 Jun, 2019 at 10:34 AM]
I’ve only lit mine once and then ran it all night.

Comment 1 to 2 of 2
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