Neon tube inverter, multiple tubes solution

[zuzu]

Hi friends,

I made myself a small UV exposure box and I'm very proud of results I used 4 small UV tubes, 7W each, originally designed for money check machines. Now they are powered each one on this own, by using ready made inverter PCBs found in kitchen / home appliances. Those are very cheap (and low quality) chinese, plastic soldered, I cannot know what electronics is inside before buy
Now the question is can I find some schematic to light all 8 tubes once? Maybe 10 tubes in future (5 top and 5 bottom)?

 

[zuzu]

I found some simple inverter here
**broken link removed**
the question is can I use 5 tubes in series (or parallel?)

Any comments? Thanks very much.