forums energies: society, ecology and clean technologies

After how many hours you win money by buying a CFL?

This is what will try to answer this small file excel or openoffice:



Download here: https://www.econologie.com/telechargeme ... uo-ou-led/

(This file follows it: sustainable-consumption / fluorescent-bulbs-a-financial-benefit-of-466-in-21-months-t4742.html )

Edit 12 / 15 Here is a simplified version of Flash for those who do not have Office: https://www.econologie.com/shop/infos/c ... gie-co2-11

That file is available here: calculation of return on investment of an energy saving bulb (fluorescent or LED)

It would be nice to quickly compare our results ... Image

Any suggestion to amend or improvement is welcome

Good work

I made an attempt to amend emailed, which takes into account the lifetime of compact fluorescent bulbs to see the impact of his life on profitability.

here is my (small) contribution

Yes I have received your file.

I'll take this parameter into account. I would also take into account the number of hours of use per day and do an ROI on year.

I will also delete the version of OpenOffice puisqu'OpenOffice reads .xls (the reverse is false by cons).

That the file was updated, it now automatically calculates the gain that the bulb allows you to carry on its life.

I remind you the link: calculation of return on investment of an energy saving bulb (fluorescent or LED)

It's funny the possible interpretation of a comparative curve.

I note that the incandescent bulb is more profitable to 3000 hours.

I can conclude that the incandescent bulb is best to € ...
Provided replace all 3000 hours ...

Gegyx what you talking about? Already in 3000h you change in 3 bulbs then ...

You're completely wrong to think so because one could say this also (and after the original data file)

a) hourly cost of an economic bulb cents: + 0,108 1750 / 15 000 = 0,224 cents / h

b) hourly cost of a conventional bulb in cents: + 0,48 235 / 1000 = 0,715 cents / h

Using a conventional light bulb is therefore in our case: 3.2 times more expensive than CFL.

The longer the life of the energy-saving bulb, the better its "profitability" is therefore watch out for 100% Chinese bulbs which arrive on the market with 3000h of life ... !!

Even if they are "at a good price", it is not certain that they will be profitable one day !! I'm not even talking about the environmental cost of this type of bulb ...

I invite you to have fun with this table to compare our results (in image if possible).

Following the remark I Gegyx I updated the file to account hourly costs.

I made the news: energy saving light bulbs: what gains or losses which money?

Like a calculation of equity CO2 ca interested in the world or not?