I like to know lamp arc voltage and current for 20 watt philip CMH?

I don't know if this will help, but the only 20W CMH lamp I can find on Lamptech is this GE one.

Thank U MissRia

 That means I am going have to rewind a fluorescent ballast
 With half thickeness of wire what on there that drives 40 watt
  Lamps and go from there.   As there not a 20 watt MH magnetic ballast in the USA to run them.

Hmmm, best of luck, ballast rewinding is not for the faint hearted 

James might know more about this, worth asking anyway.

Hmmm, best of luck, ballast rewinding is not for the faint hearted 

James might know more about this, worth asking anyway.

20W CMH needs active arctube temperature stabilization (specific response of the ballast based on the arc voltage changes, include dynamic response, so  time constants), so magnetic ballasts are out of the question (they would lead to extremely short lifetime till temperature instability would make it either cycle or shift color or even crack for overload).

<snip>   As there not a 20 watt MH magnetic ballast in the USA to run them.

Do you want electronic ballasts? From integrated lamps with failed 20w bulbs. Like these. Free.