Now that the subject actually matches the question I will reply.
Im quite confused why your buying what sounds like a complete hood lighting solution and also having an enclosed canopy. maybe your just using the terms incorrectly.
Most people who purchase a canopy wire their lights directly into the canopy vs having teh canopy simply sit over top of a hood on the tank. The fans are in the prebuilt hood units for a reason so if your putting an enclosed canopy over top of this hood then you will run the risk of rasing the temperature inside the canopy and the tank itself due to the heat output of the lights.
I would suggest going with a PC
retro kit and installing the reflectors and bulbs in the canopy that you have and then mounting teh ballast remotly.