Incandescent bulbs (40W) produce 14 lumens per watt.
CFL bulbs produce 61 lumens per watt.
LED bulbs produce 57 lumens per watt, but with a life cycle on the order of 50,000 hours. In a recessed fixture in a cieling, a CFL will lose 40% of its light reflecting it back to the cieling, while an LED bulb will deliver all 57 lumens per watt downward.