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"watt for watt", T5's and Halides generate similar amounts of heat. The perception that T5's make less heat is not correct. It is due to the lower temperature at any given point compared to halide (since a T5 bulb has about 40x the surface area per watt to shed that heat). What often is true though is that T5 systems usually include some form of active cooling (fans) which also ends up helping keep air over the water surface cooler as well. Many halide systems dont have fans so they dont cool as much... but those that do see similar benefits. Some halide pendants even have air ducting ports right on the units themselves so the hot air that the bulbs conduct/convect can be migrated right out of the system all together.
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