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The reason T5s are cooler than MH, well, they aren't cooler...but feel cooler and don't cause heat problems with the tank.....is because the heat is spread over the length of the bulb with both T5 and MH. Considering that the T5 bulbs are longer, the heat is spread over a larger area. MH don't get any hotter than T5 but the heat is condensed into a smaller area.
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