Hi Roel, congrats with you new born idea to use a synthetic inductor, clever thinking!

...And then there is my wife, who, I might add, I love very much,  and without whom I would no longer be on this earth.  She has, however, torn the side garage door moulding off the garage not once, not twice, but three times!  Maybe I will make one of these for her. 

Dear Cristovao, is your lamp working properly now or do we need to look for another solution? If you still have problems, please send an email to service@elektor.com  

Haha, thanks for challenging me. :) Professionally i'm a digital guy, writing embedded software for ARM microcontrollers, but my heart kept beating analog. A contest to make a fading LED with analogue electronics sounded as music to my ears and woke me up from my low-power sleep mode. :-)  

Roel on a roll ;-) Thank you for this interesting voyage through the land of fading LEDs. Who would have imagined so many different views on the same subject? Where will you take us next?