The Legitimiser
Join Date: Jul 2005
Location: Southampton, UK
Posts: 4,849
Bikes: Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
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This is helping. The Powerbeam light is in fact a 2.8v bulb running off 2 x LR14 cells (C cells, I think those are). I now understand the issue with upgrading that. Can you explain what you mean by "form factor"? Does that mean basically the same wattage?