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Originally Posted by midgetwaiter
The radiant heat transferred by the photons striking a surface is not a significant concern and will almost completely be nullified by evaporation at the water's surface.
Air is a shitty heat conductor and pushing it around with fans doesn't work very well. For example, this is why big transformers are submerged in oil.
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While air is not a good heat conductor, you can only saturate a given amount of air with water untill the air can't hold any more. A fan will move the wet air away and allow more dry air to become saturated during evaporation. Without doing this.............. evaporation (and free cooling) stops. (This is in the case of the aquarium itself.)
As far as the fixture itself:
While air itself is not a good conductor, moving it over a heated surface does provide an excellent cost effective vehicle to move heat away from the fixture.
Yes big transformers are filled with with oil for cooling, but the outside of this oil filled gallery is also designed as a heat sink(Largest surface area possible in a given space.) to transfer the heat from the oil to............... You guessed it! Air.
