Heat-Transfer in Reflective Globe-Type Self-Ballasted Compact Fluorescent Lamps

Self-ballasted compact fluorescent lamps (SBCFL) are widely used to replace incandescent lamps (IL) for energy saving. We studied the heat-transfer phenomena of outer globe-type SBCFLs by measuring the temperatures of lamp parts, consumption power, luminous output, and by calculating the energy balance. The applied methods are heat-transfer network analysis, and computational fluid dynamics (CFD) using FLUENT® software. The heat loss increased in reflective globe-type SBCFLs as compared to normal transparent globe-type SBCFLs was estimated at about 3 W when the total lamp power was 22 W constant. This results in a temperature rise of 20 K in the plastic holder, and a maximum of 10K at the electronic part on the circuit board. Accordingly, we have developed a 12 W reflective globe-type SBCFL, which replaces a 60 W reflective IL, not a 22 W SBCFL replacing a 100 W reflective IL, to make importance of the thermal reliability.