We used Potlight Installation Company (a.k.a potlightexpress.ca or homepotlights.ca) for installing around 35 potlights - both exterior and interior. Andre and Vladmir did a wonderful job in getting this done, excellent workmanship and planning. Did a good planning job in understanding what is the work involved, said if they have to dry any holes in the drywall etc to get it going (none needed!) etc etc. And will get confirmation of layout after setting each room up. Very professional, very well priced and ESA certified electrical contractors. I was initially considering Mr.Potlights due to their good reviews, but was referred by a friend to these guys who had done work for him. Excellent work and cheaper than other potlight contractors (good ones).