What are the major variables in determining savings?
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