Type Efficacy in lm / W Incandescent 5 - 17 Halogen 16 - 24 CFL 45 -60 FL up to 100 Current generation LED's 26 - 70 Next generation LED's up to 150 For more information see Luminous efficacyW. Current generation LED in this context means: there are many products using this type of LED. Next generation means: there are prototypes available, or the LED is in production but not used much in products