Abstract
It seems that there are no problem on the lamps for general lighting.But if we make carefully an investigation about it in detail, there are various probrems related to practical properties. The outline will be described as follows.(1) incandescent lamp: low luminous efficacy, short life.(2) fluorescent lamp: inconvenience by its long size.(3) fluorescent-mercury lamp: lumen maintenance.(4) self-ballasted mercury lamp: low luminous efficacy.(5) high pressure sodium lamp: expensive in usage and no device for safty system.(6) metal halide lamp: poor reliability of starting, lumen maintenance, flicker, etc.In this paper I chiefly describe an experimental study of these main problems.Though this research is still continuing, the auther has reached a certain conclusion.The auther provides here an outline of my findings and hopping that you will kindly provide me your comments.
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