In article RoUsf.3583$yx.617@trndny01, yourname wrote:

Details are in a web file of mine:

http://www.misty.com/~don/lede.html

GREAT website, but didn't see much data on the relative efficiency of
leds in home lighting, but I will look again

That's because there are no significantly marketed general home lighting
LED lightbulbs (equivalent to 40-100 watt incandescent) to get data from.

The most efficient significantly marketed white LEDs (last time I
checked a few weeks ago) are Lumileds "Luxeon" "1 watt" models, with
typical luminous efficacy of 37.6 lumens per watt with chip temperature 25
C, and about 34 lumens/watt typically in the more reasonable condition of
heatsink temperature of 35 C.
LEDs will need a ballast of some kind or another, and losses in that
will result in overall luminous efficacy slightly lower still.

100 watt 120V 750 hour incandescents get 16.7-17.5 lumens/watt, and 60
watt 1000 hour ones get 14-14.8 lumens/watt. Better compact fluorescents
get mostly about 60 lumens/watt.

- Don Klipstein )