Need Electrical Advice . . . MH Cord Length

[chwkreefer]

I am thinking of moving my MH ballasts from beside my tank on the second floor to my crawlspace. Is there any problem in running about 25' length of cord? I would run either 18 or 14 gauge wire.

Second question, because the existing cords going to and from my ballasts just use regular grounded cord ends, could I just make extension cords to lengthen my setup, or do I need to basically re-hardwire them? I'm not sure if there is any problems or power lost which could damage the ballast if I have additional connections.

Bill