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.
.03042 watts%2F(steradian m%5E3) * 2 pi steradian * 9 millimeter
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
