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"Conform-Lock" type E40 Lamp Base/Cap.

"Conform-Lock" type E40 Lamp Base/Cap.

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This composite picture shows an E40 Base/Cap fitted to a Generic Chinese Sc-Na Metal Halide Lamp (MH-400) by the "Conform-Lock" technique.

This technique was developed to omit the cementing step in the process of applying bases to bulbs and to make for a more reliable fastening so lamps can be removed more easily at End-Of-Life without the chances of capping cement failing due to the torque applied to get the lamp out of the socket.

This technique also gets around the "Crimp-Shell" base fastening technique, a Patented technique developed by G.E.

So, effectively the neck of the lamp conforms to the inside surface shape of the base and the blob of lead in the dimple locks it in place, hence the name, "Conform-Lock". This is the easiest type of base to remove and replace.

For a lamp collector, these details are important. because, although two lamps may bear the same type number and be functionally the same with regards to the desires of the end-user, differences like base attachment allow the lamp to be provided with a precise providence and chronology of development.

In a serious lamp database, one should provide a field for such details.

Indent Crimp 02r.jpg Crimp Shell Composite m.jpg Conform Lock Composite m.jpg PulseTrans-04.JPG

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Filename:Conform Lock Composite m.jpg
Album name:Globe Collector / Miscelaneous Lamp related stuff
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Date added:Feb 11, 2019
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Feb 12, 2019 at 06:18 AM Author: rjluna2
I have seen some bulbs with indented to feed to the base wiring for connection. I'll try to find one

Pretty, please no more Chinese failure.

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Feb 12, 2019 at 06:50 AM Author: Globe Collector
Are they E26 caps, Robert...I'm yet to see a small cap use this technique.

Manufactured articles should be made to be used, not made to be sold!

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Feb 19, 2019 at 03:20 PM Author: James
I think only Thorn used the screw-thread neck mould on E27 lamps, possibly also Sylvania on some small American HID lamps. Many lampmakers introduced this during the 1970s, but by the 1990s dropped it again due to unreliability. It was a pity because this was an easy and fast method of capping lamps, but it holds the cap much too rigidly to the glass and is prone to causing ring-offs during lamp life. It also became increasingly difficult to control when lead-containing solders had to be phased out. So most of the best manufacturers have reverted to cemented bases now.
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Feb 19, 2019 at 03:23 PM Author: wattMaster
Would it be possible to go back to screw thread bases if the glass is made stronger?


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