1984 Philips and Westinghouse mercury lamp

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A NOS 100W Philips and Westinghouse mercury lamp with a BT25 bulb, a E39 cap and DX phosphors.  It's from 1984 and is made in the cross over period wen Philips was buying out Westinghouse .

 1978 GEC 60W SLI/H lamp

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Here we have a 60W GEC SLI/H lamp from feburwary 1978 its NOS and shown in part of a 60W SLI/H fitting. note how it has the Zig Zag arc tube this was a feacher of GEC and erly thorn SLI/H lamps. this lamp (and most other 60W SLI/H lamps) run at 80V 830Ma.