2004 Volume 88 Issue 8A Pages 522-528
Minimizing our negative on the environment is a global topics of interest. Achievement of high luminous flux. Maintenance is needed for the manufacture of environmentally friendly fluorescent lamps. At first, using multiple linear regression analysis, the relation of phosphor and protective layer thickness with the luminance flux maintenance is clarified. Next, the prediction formula of luminous flux maintenance is made and it is shown that a prediction formula agree with experimental results.