17000 [K] is less than the correlated color temperature exceeding 10000 [K], the fluorescent lamp 100 having a light color in the range of 5 -2.5 is Duv, and a phosphor layer 20 and the lamp arc tube 10 , at least a red emitting rare-earth phosphor is a luminescent center which emits (11) main emission peak at 605~625 [nm], the phosphor layer 20 emits (12) main emission peak at 540~550 [nm] and a blue light-emitting rare-earth phosphor consisting of a green-emitting rare-earth phosphor which serves as a light-emission center, an emission center that emits (13) main emission peak in 440~460 [nm], the action function efficiency of melatonin suppression unit luminous flux per In and of which more than 1.0, while a fluorescent lamp for example by constituting the general color rendering index Ra of 80 or more, the functions and effects of promoting wakefulness of living body and the adjustment of the biological rhythm by suppressing melatonin secretion, I want to improve the weakness of the color rendering characteristics of the light source.相関色温度が10000[K]を超え17000[K]未満、Duvが-2.5から5の範囲にある光色を有する蛍光ランプ100であり、ランプ発光管10と蛍光体層20とを備え、蛍光体層20は、少なくとも、605~625[nm]に主たる発光ピーク(11)を発する発光中心となる赤発光希土類蛍光体と、540~550[nm]に主たる発光ピーク(12)を発する発光中心となる緑発光希土類蛍光体と、440~460[nm]に主たる発光ピーク(13)を発する発光中心となる青発光希土類蛍光体とを含み、単位光束あたりのメラトニン抑制の作用関数効率が1.0を超え、かつ、平均演色評価数Raが80以上である構成によって、メラトニン分泌を抑制して生体リズムの調整や生体の覚醒を促す作用効果を得ることができる蛍光ランプでありながら、光源の演色特性上の弱点を改善する。
