Alright folks, now things get tricky.
Photons are a mathematically correct way of lighting as the computer will calculate each and every photon of light being emitted, granted, this can take a lot of power and setup to get working properly.
The benefit is that Photons show color in reflected and bounce light very well.
1) Create an enclosed scene to best show off the bouncing photons.
2) Make a Point Light near the ceiling and turn the Intensity to 0. We are going to light this scene using the data of the photons the light emits rather than the light itself. This will produce a much more calculated result.
3) Make sure the Emit Photons option is on in the Point Light Attributes, increase Photon Intensity.
Higher exponant = quick falloff...never go over 5 if you can help it
4) Be sure you are using Mental Ray to render with and in the Render Settings, turn on Global Illumination.
5) Your first render might look like a terrible disco party, attempt to adjust this by bumping your Global Illumination Photons to above 1 million.
6) In the Render Settings, the Accuracy should usually be above 4,000.
7) Be sure Default Lights are turned off (those are what lights the scene if you do a quick render before adding actual Spotlights etc).
8) The image may be a bit spotty, reduce the spots by adjusting the Radius (Render Settings), start at a value of 1.
To show how well Photons bounce color in reflected light, I used bright colors on the walls.
This Photon lit scene took 7 min and 17 seconds to render.
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