Greetings Again
I apologize if this is not what you are specifically looking for, but thought you might want to know that a purchased light system like the one shown in the photos above can also be used with a canopy - you don't have to build your own to get things to work. I had to modify the canopy supports slightly (the "legs" that sit on top of the tank) to provide clearance around the light housing, but the lighting system and the canopy both sit on top of the tank.
For reference, both the light system and the canopy are somewhat heavy. I considered "permanently" mounting the light to the inside of the canopy, but it would be virtually impossible for one person to take it off (or put it on) the tank. It's still a little difficult, but having them separate makes it possible for me to remove / install them by myself.
I don't have any pictures with the canopy open that show the light, or I would include them.
Hope this helps...
