Reply #35: 30%? Not by my math (when producing an equal amount of light) [View All]

[KurtNYC]

Here is lumens (light output) per watt of currently available products:

Incandescent: 17 lm/W
Halogen: 22 lm/W
LED (white - GE): 45 lm/W
Fluorescent: 90 lm/W
HPS: 132 lm/W

Cutting edge (not yet available for purchase):
Cree LED (white): 131 lm/W
Nichia LED (white): 150 lm/W

I think White LEDs would have to produce 300 lumens per watt to be using 30% of the energy fluorescents use. Or are you counting the efficiency gained by dimming? I think we aren't quite there yet but we may get there.

The theoretical maximum for converting electricity to light (any spectrum) is 683 so technology may get us beyond where we are now.