Detailed Product Description For T8 120-277V UL/CUL electronic ballasts ,such as 1*17w /*25w/1*32w 2*17w/*25w/*32w, 3*17w/*25w/*32w 4*17w /*25w /*32w ,and T5 120-277V UL CUL 1*14W 1*21W 1*28W 2*14W 2*21W 2*28W 3*14W 3*21W 3*28W 4*14W 4*21W 4*28W etc. THD<10%,CCF<1.7 ,Power factor >0.98-0.99. Ballast dimentions:lL*M*W*H=240*225*43*31MM, 20PCS/CTN, 0.55KG/PCS ,Packing:300*255*145mm