Increase 3D Lighting example's light intensity

[BD103]

Objective

• The 3D Lighting example is meant to show using multiple lights in the same scene.
• It currently looks very dark. (See this image.)
• Resetting the physical camera properties sets the shutter speed to 1 / 125, even though it initially starts at 1 / 100.

Solution

• Increase the intensity of all 3 lights in the example.
  • Now it is much closer to the example in Bevy 0.12.
  • I had to remove the comment explaining the lightbulb equivalent of the intensities because I don't know how it was calculated. Does anyone know what light emits 100,000 lumens?
• Set the initial shutter speed to 1 / 125.

Showcase

Before:

After:

[MiniaczQ]

Absolute lumens don't mean much, since each renderer uses slightly different math and light will behave a bit differently. I believe lumen ratios should still be accurate, so there is that. AFAIK bevy uses magic numbers to be similar to blender's lumen values.

Maybe it's worth adding a comment about it so people don't try to use real life values

[BD103]

Maybe it's worth adding a comment about it so people don't try to use real life values

I don't know much about lumens, I just played around with the numbers until it looked similar to the 1.12 version. If you want to write a comment, you or someone else with more experience will need to add it. Sorry!