Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
- 14.18 - 2.5 log10 ((2*(70 billion kWh)/year * 130 lumen/watt)/(4*pi*(400000km)^2) / (1 lux))
- 14.18 - 2.5 log10 ((2*(70 billion kWh)/year * 130 lumen/watt)/(4*pi*(400000km)^2) / (1 lux))
Natural Language
Math Input
Extended Keyboard
