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When changing normal fluorescent lamp its so uncomfortable and hard so we should stretch all of our hands.
A Sockets hole is too small so its difficult to insert and also cant see well to be hided by the shadow.
'Articular Socket' are much convenient to use in replacing fluorescent lamps due to its vertical position where you simply plug and unplug the terminals. In addition, the luminous socket holes allows you to replace lamps even in the dark.
Youngnam University
Gyeongsan-si, Gyeongbuk, South Korea
Yeungnam University
Deagu, South Korea
Kwon yong hoon