Energy saving lamp
Much is said about ESL; as if, it is our only saviour in these days of power crisis. While calculating power or energy with conventional electric lamps, such as tungsten filament lamp or florescent tube, the power factor is taken to be unity by electricity supply authorities. But while comparing ESL with tungsten filament lamp or florescent tube, it is seen, the power factor of ESL is taken as unity and that for conventional lamps is set at 0.8. Why is it done? Is it to give ESL an edge over conventional electric lamps in matters of saving energy ? Is the power factor of ESL actually unity? Does the ESL have uniform efficiency all over its life? Does its efficiency hold good at all voltage level? What effect does it have on eyes of human beings? A lot of questions like these cross our minds, but nothing of this sort is publicised. The intensity of light of ESL is higher than those of conventional electric lamps, no doubt; but its brilliance impinges on the eye. So what should we opt for health or economy?
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