like my recent airport runway light project "yea we run 4.6vac" for 9 month= s, thousands of dollars of developing 25 prototypes, just to get out to cle= veland and find out that 4.6 vac is max, 2.6 vac is min, and we are standin= g out there in a runway in freaking january with a thumb up our butt. just the way it goes