Michel - that's exactly what happens. IN-9 tubes are significantly brighter 
than IN-13, and to my eyes much better for general use. I made this thing (
http://youtu.be/mQ1567EFCY0) with IN-13 and both flavours of IN9. Although 
the IN-13 were bigger, used less current and were more predictable to play 
with, the dimmer display meant that version needed a fairly low ambient 
light environment. FYI IN9 are also more prone to 'sleeping sickness', 
particularly the argon ones.
 
Cheers,
 
Jon.
 

On Wednesday, November 28, 2012 10:00:26 PM UTC, Michel wrote:

> Thanks for the info Adam. It doesn't really explain why the current is 
> higher / sensitivity is lower for the IN-9. I still expect the IN9 to be 
> brighter as the higher current should ionize more neon. Maybe I should 
> measure it one day.
>
> Michel
>  
>

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