FLUORESCENT LAMP

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Disclosed is a fluorescent lamp (100) having a light color with a correlated color temperature of more than 10, 000 [K] and less than 17, 000 [K] and Duv in the range of -2.5 to 5. The fluorescent lamp (100) comprises a lamp arc tube (10) and a phosphor layer (20). The phosphor layer (20) comprises at least a red light emitting rare earth phosphor, which serves as a luminescent center having a main emission peak (11) within 605 to 625 [nm], a green light emitting rare earth phosphor, which serves as a luminescent center having a main emission peak (12) within 540 to 550 [nm], and a blue light emitting rare earth phosphor, which serves as a luminescent center having a main emission peak (13) within 440 to 460 [nm]. The fluorescent lamp has an action function efficiency for melatonin suppression per unit light flux of more than 1.0 and an average color rendering index Ra of not less than 80. According to the above constitution, the fluorescent lamp allows to attain the function and effect of regulating the biological rhythm and promoting wakefulness of a living body while suppressing melatonin secretion and besides improves the drawbacks in color rendering characteristic of the light source.