I posted this in response to a question about buying Vistalite bulbs, so it probably got missed by some who may care to read it.
I have a set of Vista lights, purchased some years ago. Recently I thought I would update them, the halogen bulbs being expensive to keep replacing. I bought a couple of the Cutter Cree XR-E 500 kits http://www.cutter.com.au/proddetail.php?prod=cut685 and set to work.
I expected to have to remove the bulb connector, but as luck would have it the star sat neatly on the internal casting webs, leaving room to tuck the puck alongside the optic holder. I just had to connect the input leads to the rear of the bulb connector in order to pick up power, leaving the switch in circuit.
I wired the pucks in buck mode so I could continue to use the original Vista battery pack, which is I think 7.2 volt. I had to cut a couple of circles of thin perspex to be glued into the front covers for protection. I haven't sealed the fronts fully, but following a wet ride home from work the other day I think that might be a good idea. Some clear silicone sealant will do.
My hybrid bike used for commuting and road rides:
External view of the lights:
With the cover removed, showing the star sitting on the internal webs and the puck alongside:
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Thread: Vistalite mod