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The four-pin butterfly lamp must be used with a ballast, the link of the ballast: 2D Tube Parameters:Lamp holder: 4 needleRated voltage: 220VRated power: 10W 16W 21W 28W 38WLife: 6000 hours Dimensions:2D 21W lamp: 11 * eleven , diagonal 13 cm2D 21W lamp: 13 * 13 , diagonal 16 cm2D 38W lamp: 20 * 20 , diagonal 24 cm2D 55W lamp: 25 * 25 , diagonal 30 cm Features:1 product is of fine quality, lengthy life, excessive luminous efficiency, significant calories saving, energy saving commission of 80%, the natural light color, natural tricolor tube three-color phosphor, high brightness, tender output will increase soft, lengthy use of the eyes won't fatigue, upgrade paintings performance delicate is small, either ends of the interior electrode fitted with a protecting ring, effectively decrease electrode sputtering, cut blackheads, enlarge lamp life: supporting the ceiling using, to be used in home lighting or lighting fixtures in public places.