sentences:  Halogen lamps (18lm/watt typical) are more energy efficient than regular incandescent lamps (15lm/w typical) but still fall far behind other more-recent types such as fluorescent lamps (80-100 lm/watt), gas discharge lamps (100-200 lm/watt depending on types), and LEDs (125-150lm/watt typical in bright white depending on style).https