I would like to introduce to you Nemesis, a power supply achieving:
• Efficiency: 94% @ 277Vac, 92% @ 120Vac
• Power Factor for 50-100% load: >0.930 @ 277Vac, >0.990 @ 120Vac
• THD at full load: 9.9% @ 277Vac, 4.4% @ 120Vac
• Input Power in Standby: 325mW @ 277Vac, 226mW @ 120Vac
• Power Density: 8W/in3, 4.900” x 2.500” x 1.530”
If you are interested in details, please visit: http://www.SMPS.com/Design/Nemesis/Nemesis.shtml