the designs are according to internation IEC and GB137000.10-2002 standard,can be conected to streight or angle. the framde is made of zinc alloy and print silver color,louver is made of import  frosted  Acrylic,make the light more softy.specification has T5,  2*14w,2*21w,2*28w,2*35w,3*14w,3*21w,3*28w,3*35w.