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4-Pin lamps are slim compact fluorescent lamps 
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Square shape provides uniform distribution of light 
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Extremely low profile good quality of light long service life 
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Short and compact pin-base lamp with double-turn tubes 
4-Pin lamps are slim compact fluorescent lamps
Square shape provides uniform distribution of light
Extremely low profile good quality of light long service life
Short and compact pin-base lamp with double-turn tubes