4 ms·

How much do you pay for electricity? Over 10 years, the difference probably makes this cheaper, even with such a small difference. 2.5 Watts, 6 hours/day, 300

How much do you pay for electricity? Over 10 years, the difference probably makes this cheaper, even with such a small difference. 2.5 Watts, 6 hours/day, 300 days/year, 10 years, 0.13 USD/kWh [2] => 7.2 USD saved in electricity [1] Count in the replacement CFL prices, 3 USD vs 13 USD, and the costs are pretty much equal. Point being: Electricity is the biggest cost. [1] right?: https://www.google.com/search?q=2.5*6*300*10*0.16%2F1000 https://www.google.com/search?q=2.5*6*300*10*0.16%2F1000 [2] from here: http://www.bls.gov/ro9/cpilosa_energy.htm http://www.bls.gov/ro9/cpilosa_energy.htm

ars 14y ago
Your math is fine except it's 1.5 watts, so savings of $4.88. Use wolfram Alpha with units and you can be sure: http://www.wolframalpha.com/input/?i=1.5+watts+*+%240.13%2FkWh+*+25000+hours http://www.wolframalpha.com/input/?i=1.5+watts+*+%240.13%2Fk... But the thing is I don't trust the hour ratings, not on CFLs not on these. So I'd rather pay the smaller amount upfront and not gamble.
aaron695 14y ago
Maths is wrong Where have you deducted the expected ROI on the money you've invested on the asset? Also the numbers are to high, not many rooms are on 6 hours a day. Electricity is actually a fairly insignificant for lighting/ power use by consumers in general. People like these things because they are easy fixes, not because they achieve much. But I'd say the real benefits is in business and cost reductions in labour replacing light bulbs. It's the longevity not the reduced power use that has the value in commerce.
FoeNyx 14y ago
The electricity hour rate will probably vary in the next 10 years. In some parts of Europe the cost will go up by more than 25% in the next 2 years. There is also the long term benefit of lowering global consumption of electricity: probably less CO₂ rejected in atmosphere, and decreasing power outage risk in regions badly interconnected with the grid.

ars 14y ago

Your math is fine except it's 1.5 watts, so savings of $4.88. Use wolfram Alpha with units and you can be sure: http://www.wolframalpha.com/input/?i=1.5+watts+*+%240.13%2FkWh+*+25000+hours http://www.wolframalpha.com/input/?i=1.5+watts+*+%240.13%2Fk... But the thing is I don't trust the hour ratings, not on CFLs not on these. So I'd rather pay the smaller amount upfront and not gamble.

aaron695 14y ago

Maths is wrong Where have you deducted the expected ROI on the money you've invested on the asset? Also the numbers are to high, not many rooms are on 6 hours a day. Electricity is actually a fairly insignificant for lighting/ power use by consumers in general. People like these things because they are easy fixes, not because they achieve much. But I'd say the real benefits is in business and cost reductions in labour replacing light bulbs. It's the longevity not the reduced power use that has the value in commerce.

FoeNyx 14y ago

The electricity hour rate will probably vary in the next 10 years. In some parts of Europe the cost will go up by more than 25% in the next 2 years. There is also the long term benefit of lowering global consumption of electricity: probably less CO₂ rejected in atmosphere, and decreasing power outage risk in regions badly interconnected with the grid.