They're t5 LEDs.
I found them to be superior to t5s in heat and life of spectrum but you will NOT get the pop you expect from led with these bulbs.
I still supplement my 6 bulb Rsm 250 with an led stunner.
I bought four e5s and onlys use 2 because I found the t5s made for better looking corals (aesthetically, didn't notice a difference in health).
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Red Sea Minimum
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