= Light transport =

== Radiometry recap ==

What is radiant flux?
* total amount of energy passing through a surface (measured per second)
* Radiant flux in Watts or Joules/second

Why do we not use radiant flux?

* When we emasure a high flux val, we dont know if lots of energy through a
  small surface, or a little energy through a huge surface
* TLDR its to ambiguous