> > http://home.clear.net.nz/pages/joecolquitt/luxeon_lamp.gif
> 
> Is there a purpose in the fuse F2 being between one cell and the
> other three? It looks purposeful, but I can't really see one

AFAICS F2 isn't mentioned in the Part 1 text, which covers the
technical/how-it-works. Although, as luck would have it, I can't
find my May issue, which has the constructional details and may
refer to F2. I wanted to find it anyway to pass on the windings
of the step-down transformer T1, based on an FX2240 pot
core/bobbin, as is L2

If you go to April 2006 of Silicon Chip's download page

http://www.siliconchip.com.au/menu_1701/cms/attachments/index.html

you can download the .hex and .asm for the project. The asm is
commented and will give you some idea of the capabilities and
functions of the driver circuit

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