... .99, THD<8% 3.power: 14w,21w,28w,35w,49w 4.high lighting efficiency Detail specification:1, no flicker and humming ... sound2, wattage including: 2’14w, 3’ 21w, 4’28w, 5’35w 6,2’21w, 8,2’28w3, voltage including: 230V ... into the lamp holder socket5) Turn on power supply T5 2ft, 3ft,4ft, adapter