Mogule Base Metal Halide Bulb 6500 Kelvin Color Temperature Horizontal Mounting Position Made in Japan (Iwasaki MT400DL-E39/41R version for aquarium trade) Designed to run on Mercury Ballast, standard halide will run the bulb with little color or output loss. This new 41R bulb actually specs out around 7600K, but is still listed as 6500K.
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