METHOD OF MANUFACTURING FLUORESCENT LAMP, FLUORESCENT LAMP, ELECTRIC BULB TYPE FLUORESCENT LAMP, AND LUMINAIRE

摘要

PROBLEM TO BE SOLVED: To control a phosphor layer film thickness of a light emission tube portion between both electrodes which serves an important role for fluorescent lamp light emission efficiency so that the whole luminous flux is 80% or more of the whole luminous flux at an optimum film thickness (25 μm).SOLUTION: A fluorescent lamp that uses as a light emission tube a glass tube for a spiral light emission tube of a double spiral type called a full spiral which has uniform revolution up to the end or a half spiral having a linear portion extending in the opposite direction to a revolution portion in a revolution axis direction from a revolution end is characterized in that a phosphor layer film thickness of a light emission tube portion surrounding at least between both electrodes is 10 μm or more and 90 μm or less.