You could investigate the option of efficient arena lighting in place of incandescent such as high pressure sodium etc, these use way less than normal incandescent, the down side is the colour distortion.
Figure out your max total load at any given time and the Electrician should be able to figure it out for you.
But if you consider expanding any time in the future, this should be accounted for.
Also keep in mind the duty cycle, how much and how many machines or circuits are you going to be using at any one time
Al.