Patrik, further to my last reply, I made this up while watching the
midday news today. I baulked at paying $30 for a lamp I didn't
really like. Used scrap and got exactly what I wanted

http://home.clear.net.nz/pages/joecolquitt/makelamp.html

I've stuck with the plain resistor as the gel cell is rechargeable
and the lamp is used intermittently, but I would consider a driver
chip if either I was running disposables or using the light for long
periods

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