  The amperage is on the label of the ballast. When you connect the ballast to power you will see it along with the voltage and pf of the ballast. F40T12 twin 8 foot tubes, ballast usually draws about .75 amps. The amperage is on the label of the ballast. When you connect the ballast to power you will see it along with the voltage and pf of the ballast. F40T12 twin 8 foot tubes, ballast usually draws about .75 amps.
A Single Din is the standard size of a head unit (the stereo in the dash of your car) a double din is twice as large. Double dins are good for cars that have large stock head units like a caddyhas.
One of my favourites is Single: die Single is a 9 vinyl record (like die Platte), der Single is an unmarried man, and das Single is a singles match (e.g. in tennis, like das Spiel). I'm sure other people can add other helpful guidelines below. I always compare this to pronunciation in English.