  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.
Single DIN head units can only be replaced with other single DIN units, but you have more options if your car came with with a double DIN stereo. If your head unit is about 4 inches tall, that means itâs double DIN, and you can replace it with another double DIN head unit if you want to.nswer: To answer your first question, a â2 DIN car stereo,â is just the bigger of the two form factors that almost every head unit conforms to. The two main radio sizes are âsingle DINâ and âdouble DIN,â and itâs actually pretty easy to figure out which one you need.