sentences:  The least efficient of these lamps produce about 26 lumens per watt (lm/W), which is similar to the efficiency of halogen MRs.The most efficient of these lamps available today produce about 100 lm/W, which exceeds the efficiency of compact fluorescent lamps.In terms of total luminous power, such lamps range from being significantly less powerful than their halogen counterparts, to being comparable to the lower power halogen MR16s.