Just one correction: inrush current of a filament lamp (or heater) is a 
physical characteristic of the component and not something one designs to 
happen. Every filament or heater be it huge or tiny has an inrush current, 
and the amount of it and the time that takes between this maximum current 
and the nominal one is a function of many physical characteristics.

The suggestion of using a current source is to limit this inrush current 
and thus avoid the possible damage caused by it.

On Thursday, February 22, 2018 at 3:45:30 PM UTC-3, Tomasz Kowalczyk wrote:
> I think the inrush current is needed for bigger filaments and/or faster 
> switching - small bulbs (and, I hope, numitrons) have short pieces of wire 
> with low thermal capacity. 

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