blackswan555 wrote: »
I find CFL`s to be a joke, A high % of their light emitting surface is facing itself, And as for energy saving, That depends on which set of numbers you read, try doing Volts x Amps
If you work in VA as we do, A 20w CFL will actually "pull" 36 VA (translates to watts the way we work) It costs more, has nasty (er) chemicals & is a horrible light to work by, give me 40w incan vs a 20w CFL in 99% of applications.
Have a good one
PS when the new Smart meters are installed, I wonder what they meter in ? VA by any chance ?:D
BB. wrote: »
Here is a simple build it yourself solar power measurement meter:
Micro Circuits Labs do-it-yourself solar irradiance meter
He also sells data loggers and kits to build your own data logger:
Micro Circuits Labs
And he has a nice section on how solar panels/power works:
Solar Power Basics
BB. wrote: »
Commercial lamps (as I understand) are defined to be "failed" when their output falls to 50% of rated lumen.
Our eyes perceive light in a "logarithmic" function--so it ends up that a factor of 2 (or 1/2) is barely perceptible by us humans (pretty much you have to do an A/B test to see a 1/2 or 2x difference in light output).
On the other hand, a factor of 1/10 (or 10x) is a huge difference where the brighter source will overwhelm the dimmer source...
Set up a light meter (or even a small solar cell connected to an amp meter) and measure the light output (solar cell current is linearly proportional to amount of energy on the face of the cell)... This setup should be accurate enough for you to compare between times of use, lamps, and over a year fairly nicely.
n3qik wrote: »
Well the world is going to end Dec. 2012, so I would not worry about it. But if we are still here in 2014, I think LED is/will be the way to go. 80% of my lights are LED.
nvyseal wrote: »
Has anyone noticed that CFL's lose their brightness after a year or so of usage or is it just me? I swear my lights used to be brighter. I'm not talking about when you just turn them on, but even after an hour of usage they seem to be not as bright