OK, for those interested here are some pictures of the conversion:
Because the LED package has its own beam forming optics, integration within the original cateye package was rather straightforward, as described in my earlier post. This can be seen in the picture of the re-assembled light, with the top cover removed. The red heat-shrink sleeving behind the lens assembly contains the ballast resistor. There is also a close-up shot of the lens assembly and a picture of the unit in operation. Unfortunately, I don't have my other lamp with me to attempt a comparison. Another day perhaps.
Tomorrow I hope to be able to post a ride report!
Cheers,
Ed
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Get a bicycle. You will certainly not regret it, if you live.