I am familiar with electricity , I had ac/dc and digital electronics courses in college. What i am trying to find out is if you have 7 Topdog lights ( upon customers specific request ) what size transformers do you need. We are lighting up a wooden bridge he just built about 200' long going to lake. He wants these lights about 20' up. The area is in a wooded area has standing water and stays wet ( to walk in ) a long time after it rains. The problem is I am not familiar enough with the lights , nor the USUAL transformer sizes on the shelf you can buy. Do they come in 100, 200 and/or 300 watt?