... is a biggest & professional manufacturer focus on Low frequency induction lamp ( warranty 5 years, energy saving 40~50%) & induction ... lighting, grow lighting, etc. Advantage of our product-- induction lamp: (Ballast of induction lamp with UL, CE, FCC, EMC certificate) (Pls see ... other factories is -20~40 C degree. However, our induction lamp could work between -40~40 Cdegree. (3) Longer warranty ...