I product features:  using unique pulse phase modulation method eliminate tubes acoustic oscillation   to ensure the safety of tubes, prolong services life.    adopt unique pulse deduct technology to achieve overload protection.  its consumption is low, the efficiency is as high as 96%; the power factor above 0.99,  low total harmonic current distortion, less impact on power network.  wide working voltage range: ac 90v~260v, which can guarantee the output power constant  when the input power voltage is unstable.  perfect protection function, such as built-in overvoltage, undervoltage, output short circuit,  open circuit, which can protect automatically for safe use.  low temperature rise, it is suitable for wide range environment temperature: -30ºc to +50ºc(-22~+122f) Ii technical parameters Lamp watts:      400w high pressure sodium lamp Voltage frequency:     50/60hz Input voltage range:  160-260v  ac Power factor:   >0.99 Wave crest ratio: =1.7 Short circuit           yes Open circuit            yes Over-temperature      yes Lamp failure            yes Temperature range :          - 30 ºc ~ + 50 ºc Size (l * w* h)           197 x 106 x 63 mm Iii: standards and certification: Safety                            en61347-2-12 Emi                                en61000-3-2 Ems                               cisper15.Ed7.2 Quality standard               iso9001 Environmental standards    iso1400  Related certification          ce/ccc