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The "R" is for resistor. The Iwasaki company put these carbon resitors in the bulbs to make them burn whiter for reef keeping. I don't really have much more knowledge than that about them. Christy or Troy can probably elaborate on that one a bit.
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Actually, that's more than I knew. The only thing I new was that they were for the aquarium. BTW, I bought new bulbs this past weekend so I'll send you one of the old ones to compare.