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The Flolight 55W Biax 5,400K Replacement Tube is a power efficient, high output, cool running lamp with a high CRI of 92 and a long lamp life of 10,000 - 20,000 hours. It is compatible with Flolight FL-110, FB-110, FL-220, FB-220, FL-330, FB-330, FL-440 and FB-440 fluorescent fixtures.