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here's info on the cold cathodes,
12 volts and about 0.3 amp

so could i do 4 rows of 2? and what resistors would i use?

thank you for the help btw. I understand that I'm not the clearest person because i'm not sure quite what i'm doing, so thank you for bearing with me.

hi,
Code:
   *  Tube diameter: 3.0mm
    * Tube length: 300mm/100mm
    * Input voltage of inverter: 12v
    * Output voltage of inverter: 680v
    * Current draw: 5.0mAv
    * Brightness: 28,000~30,000 cd/m²
    * Lifetime: 30,000 hours rs

You cant 'row' the cold cathode lamp.
Just drive 4 connected to a 12Vdc psu
 
going to have to stoop to lamens terms for me. just splice 4 into 1 12vdc power supply unit? could i still use a 24 v one so i could use 8?

I wouldnt recommend connecting two 12V cold cathode lamps [internal invertors] to a single 24V supply.

Use a 12Vdc supply and connect all 4 lamps to it directly.
 
ah so to do 8 i would need to do 2 separate supplies. is there a certain amplitude i need for the supply? this method seems much easier then the previous.
 
ah so to do 8 i would need to do 2 separate supplies. is there a certain amplitude i need for the supply? this method seems much easier then the previous.

Just one 12V dc power supply will be enough for all 8 lamps.

Contact the lamp supplier ask them what 8 current 8 units would require,
 
i don't know quite what that means, but sure, i can ask...
what do i want the response to be lol

They will tell you how much current the 8 lamps will require, you then buy a suitable current rated 12Vdc psu.:)
 
Thank you much! I'll post the response just to make sure i'm still on the right track. I'll also post if it works
 
after many days of emailing like 5 companies, i am still without an answer. i have no idea how much current 8 cold cathode tubes would require. Is there any way for me to figure this out without them? or is there another way?
 
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