Osram Electronic Transformer Ot-12/230 - 240/10V 4050300609232 It is the lowest cost solution for reliable operation of a hf-essential II fluorescent lamp that is both economical and reliable. It is also an ideal entry level product for electromagnetic system users who want to take advantage of electronic ballasts. The cost-saving and reliable hf-essential II is in A2 energy efficiency class and its robust design meets all relevant international safety and performance standards. .