[lepton]

Using just 10 watts and a single LED component made in the USA, the LED light uses just 1/10th the electricity of an incandescent light bulb

That is a nonesense statement. It uses 1/10th the electricity of any type of light bulb whatsoever that uses 100W, including a 100W LED array. It uses 2/3rds the electricity of a 15W incandescent light bulb, not 1/10th.

The real question is what is its comparative light output, and will it make you blind or give you migraines?

[Freeport]

I agree with your math and I too would like to see them rated in lumen. According to the web site, they seem to be relating it to the output of a 100W incandesant bulb, though even that is suspect: "Our premium 10-watt EcoLED white light bulb that replaces a 100-watt regular bulb. Lasts 50,000 hours and saves you nearly $450 in electricity over its life*.".

[Freeport]

Also the 50,000 hours seems way low for an LED. Maybe I’m just used to industrial units that last upwards of 450,000 hrs. Still, 50,000 hours is 5.7 years... Not great, but a start.

[TKDietz]

The light uses 10.8 watts and only produces 400 lumens. So, it gets a lackluster 37 lumens per watt, far worse than most compact fluorescent lightbulbs.

Here are the specs:
http://www.betterlifegoods.com/ProductDetails.asp?ProductCode=LED-CAT21417