DC current limiter for xenon lamp

[gusts]

Hello all!

I need a power supply 20 VDC and 7,5 (A). I want to power a xenon short-arc lamp. However, as far as I know as the lamp heats up it draws more and more current and that's why a current limiter or ballast is required. What would be the best sollution to limit the current to no more than these 7,5 (A)? When I powered a mercury lamp I used a coil. However, that lamp was powered from mains voltage but the xenon lamp requires DC voltage so a coil isn't suited for this purpose.

Thanks
gusts

 

[FvM]

Xenon arc lamps are usually operated from constant I (current regulated) supplies. The open circuit voltage of the supply is required to be factor 3 or 4 of the rated voltage.

 

[chuckey]

Just get a PSU that will deliver MORE then the required voltage and has a variable current limit, which you set to 7.5A
Frank