You might get some data help here
The Fermilab Dyson Sphere Search Program:
http://home.fnal.gov/~carrigan/Infrared_Astronomy/Fermilab_search.htm
Space/Science » in reply to re: Aiming at infrared glows
The Fermilab Dyson Sphere Search Program:
http://home.fnal.gov/~carrigan/Infrared_Astronomy/Fermilab_search.htm