Ok, found it.
Thats $300 and best case 70Watt in power savings.
@$.25/1kWh, $300 equals 1200kWh.
1200kwhr/70w=120000/7=17'150hrs of use at 100% load.
So you only have to play 2years 24/7 to amortize it, lol.

The energy used it production is not included.

[ to post on previous pages
About BP spill, i knew a person with a very interesting project to recover the petrol/gas/solid from the well( aside from many details, even for me the idea seemed very promising) but his superiors 'stopped' him because ''BP has paid already a lot in this matter''... ]

In general i think that EU is in quite bad position if things turn bad, energetically speaking. I don't know if really that accurate, but i seen data that we have to import 55% and increasing of our total energy needs. If something happens ( e.g. supplies from biggest energy exporter to EU) our lives most probably will change ( good or bad? )
Surely there is need for decreasing consuption, increase production of energy within EU, increase renewables ( for solar, its energy production around 2008 has doubled, still covering only 2% of total energy in EU.) Diversification might help too as we wont rely by only one exporter. Fuel switching too for not depending only by one source of energy. however it isnt really clear what the economic costs are or if its really feasible.
20-20-20 was something good on paper, but few countries made and are making really progress, especially in current times that they face ''more important problems''.

About all this, i am not positive because i see not much progress in this complicated system( kinda i am hoping for the best but expecting the worst). Especially is 'very promising' :rolleyes: that in the later climatic talks we still postponed action for 2015 or 2020, especially if we consider we are already 20 + years since talks have started ( but institutions are always positive :rolleyes: )
Sorry for my probable mistakes in English