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With BFG EX-1200 Power Supply, BFG is introducing the Modular, Frequency Conversion Power Supply: The EX Series. By using Frequency Conversion technology, the EX1200 power supply can actually emulate virtually any size power supply and therefore be at least 80% efficient, even with loads as low as 10% of the unit’s maximum capability. 
BFG LS-550 power supply is part of BFG’s LS Series which features a typical efficiency of up to 85% so more power is converted to DC than many other power supplies on the market.