Thanks...that info makes the point even better. (I can’t remember where I got that 10% number from, but it could have been some government report where they were trying to make CFLs sound even better...)
My “4 times” figure was also over-simplifying things. Incandescent bulbs emit less visible light per Watt, as the wattage goes down. For instance, a single 100 W bulb emits about twice the light of a 60 W bulb. The (light emitting) efficiency of LEDs and CLF bulbs don’t vary that much by capacity. 100 W bulbs use about 4 times the Watts/lumen as CFLs or LEDs; but 40 W bulbs use about 5 or 6 times as much. Flashlight LEDs use about 1/10 as much juice as an incandescent flashlight bulb. Christmas tree LEDs can be even more “efficient” than flashlight LEDs; because their light doesn’t have to be filtered, to produce the different colours.
That said; I think you’re right — the report you read spun things to cast the most favourable light (ahem) on CFLs or LEDs. They weren’t entirely wrong — just misleading. The 10% figure applies to flashlights and Christmas lighting. For standard room lighting, 25% is a more accurate estimate.