TV comparison: LED v LCD v Plasma TVs

I did some comparisons of TVs and how much they cost to run and it looks like the most economical to run don't necessarily are not the cheapest to own and use in the long run as seen by this table below. Notice the price of electricity at 19cents/kilowatt.

Hours of TV per Day			5
	Cost of Electricity		0.19	per kilowatt
Cost to run	Plasma TV (42 inch)			LCD tv (40 inch )			LED 40inch
	0.4	kilowatts		0.2	kilowatts		0.14	kilowatts
Cost per day	0.38			0.19			0.133
7days/wk	2.66			1.33			0.931
Per year	138.32			69.16			48.412
I saved $400
Pay back period
	5.78369	years
Purchase	$1,100			$1,250			$2,250
	Payback period		is	2.168884	years		48.19742	years

Now if we increase the price of electricty to 38 cents, (as these 'motivated groups' have been telling us Bustards), then the cost to run changes slightly.

Hours of TV per Day			5
	Cost of ELECtricty		0.38	per kilowatt
Cost to run	Plasma TV (42 inch)			LCD tv (40 inch )			LED 40inch
	0.4	kilowatts		0.2	kilowatts		0.14	kilowatts
Cost per day	0.76			0.38			0.266
7days/wk	5.32			2.66			1.862
Per year	276.64			138.32			96.824
I saved $400
Pay back period
	2.891845	years
Purchase	$1,100			$1,250			$2,250
	Payback period		is	1.084442	years		24.09871	years

You be the judge.