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400w BLV NAH-TSX "SON-L" 1 x 400w BLV double ended high pressure sodium lamp. Interestingly, this lamp has R12.5s caps on it which seems to make it compatible with G.E.C's SON-L series of lamps. The Osram-GEC SON-L range was introduced in 1974 and was the first double ended high pressure sodium lamp brought to market. They employed a thin quartz outer envelope which would not melt when brought so close to the arc tube which enabled these lamps to be positioned right in the focal point of a compact reflector system for excellent optical control. Other companies soon introduced their own versions with Thorn quickly becoming the market leader with the R7s capped SON-TD range. Osram also introduced a range with Fc2 caps. SON-L was discontinued in 1994 so it's interesting to see a BLV branded one. There must have been some demand for some time for another company to deem it worthwhile to produce them.

400w BLV NAH-TSX "SON-L"

1 x 400w BLV double ended high pressure sodium lamp.

Interestingly, this lamp has R12.5s caps on it which seems to make it compatible with G.E.C's SON-L series of lamps.

The Osram-GEC SON-L range was introduced in 1974 and was the first double ended high pressure sodium lamp brought to market.
They employed a thin quartz outer envelope which would not melt when brought so close to the arc tube which enabled these lamps to be positioned right in the focal point of a compact reflector system for excellent optical control.

Other companies soon introduced their own versions with Thorn quickly becoming the market leader with the R7s capped SON-TD range.
Osram also introduced a range with Fc2 caps.
SON-L was discontinued in 1994 so it's interesting to see a BLV branded one. There must have been some demand for some time for another company to deem it worthwhile to produce them.

387A7712.JPG 387A4626.JPG 387A3566.JPG 387A6469b.JPG 387A1060.jpg
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Filename:387A3566.JPG
Album name:FrontSideBus / HID: High-Pressure Sodium
Filesize:8298 KiB
Date added:23 Apr, 2026
Dimensions:3072 x 2048 pixels
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URL:http://80.229.24.59:9232/gallery/displayimage.php?pid=24713
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Comment 1 to 6 of 6
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Andy   [25 Apr, 2026 at 11:46 AM]
Interesting! I hadn't realised these were a replacement for the SON-L. ALways wanted to find a SON-L fixture but never found one.
FrontSideBus   [26 Apr, 2026 at 04:05 PM]
I imagine fittings for these are even rarer than the lamps at this stage!
Alex   [28 Apr, 2026 at 06:10 AM]
A very nice even if it is not the real deal by GEC, but still very close… Just sucked away the last on ebay for myself
FrontSideBus   [28 Apr, 2026 at 04:47 PM]
If it's the same seller, it will be interesting to see what turns up as the pictured lamp in the listing had R7 caps!
Alex   [28 Apr, 2026 at 05:29 PM]
itwas also listedas an tanning lamp
AngryHorse   [28 Apr, 2026 at 06:34 PM]
My old place of work had one on the front, I remember the fitting being skipped, but at the time I didn’t see what I would need with one and left it! Shocked Embarrassed

Comment 1 to 6 of 6
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