If I'm understanding your question, I think it depends. My AGA 75 didn't come with a canopy, but had standard AGA lights and plastic on top. When I purchased my canopy from AGA, it fit perfectly over my lights without the need to change anything. Later, when I upgraded to a Coralife 4x65w fixture, that too fit very well under the canopy. My current 180G project tank has a wood canopy and glass tops, but it's much different in function and style than my 75. I'm going to have to get blocks of wood and drill into the canopy to get decent lighting.
In my Oceanic, I have a glass top to reduce evaporation with a light on top and a canopy that covers all of that from sight. I would not use the canopy without the glass top mostly for evaporation and temperature reasons . . .
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