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this would have been perfect for you
http://www.lfgss.com/thread49367.html
3rd dibs might be meaningless but...
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wowow amazing!!
Thanks for the specific instructions, I'm definitely gonna try one.
First I need to surf fleabay to find SA light with a switch ho!stick the photos here when you are finished I'm looking forward to it:-)
pretty easy really
only thing is you need to get a SA light with a switch - I think a lot didn't have them, the switch is three way so I think it was for the old battery pack sets where you could switch between the dynamo and batteries
so

(note little black switch)
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snap connector - 99p in maplins
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AA battery box - also 99p in maplins - fits easily in the back of the light
then just chop the wire (SA lights had two wires, unlike a lot which had one wire as neutral was fed through the frame), connect the wires from the snap on connector (I'll solder this but you could bodge with some scissors and sellotape tbh) to the end of the wires and replace the bulb with the LED one
the LED replacement bulb has regulation electronics in and takes a wide range of voltages so you don't need to to worry about blowing it
you could just use a 9v battery instead of the battery pack too, don't know which would last longer though
the other good thing about SA lights is they have a hinged front for bulb replacement, so to change the batteries I will just need to open the front and disconnect the snap connector
simples
I'm thinking about making it trickier for myself and using all three points of the switch though, so that one on position is full and one is wired through a resistor for low beam =)
need to finish restoring the chrome first though, I got the front and back for 99p from fleabay but they were badly pitted and it's taken a lot of WD40, coke and brasso so far...
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now THIS sounds really interesting..
Is it gonna be complicated job to finish? if not I want to make the same!
so I should buy one of old SA front light that has a built in switch, and that screw in LED replacement then.
Let me know how it goes, I want to see the result :-)not with a 50 lumens LED replacement they're not =)
I'm currently working on 'project Sturmey Archer' - turning an old SA front light with a built in switch into a battery powered (via internal battery pack) LED superlight (using one of these - a screw in LED replacement)
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Art vs Science, shit they are awesome!