High intensity discharge lighting or H.I.D.'s offer the most lumen's per watt then other types of lighting. The most common lighting used to grow coral is H.I.D.'s , high output fluorescent's , and L.E.D.'s , all of these lights have proven to grow coral under certain circumstance. H.I.D.'s have a longer life span and maintain there original output longer then the other lights mentioned. L.E.D.'s or light emitting diodes are some what new to the aquarium world and have mixed reviews on grow results. L.E.D.'s boast high lumen's per watt , low cost to run , little to no heat output , and triple the life span of H.I.D.'s. Only time will tell if L.E.D.'s will surpass H.I.D.'s as the reefers choice of lighting.
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