I'm not sure what the intended behaviour is, but playing around with it suggests that a white emission shader of strength 1.0 will produce light exactly as it is configured in the light properties panel. You can check this by setting you light power to 0W, no matter what you set the node values to, do you'll not produce any light. Regarding color it is important that you set your light color to white if you intend to set the color of the node, this works in much the same way.Ĭoncretely, it appears that nodes filter/amplify the light itself. So if you have a 1000W light and the strength set to 0.5 then you should have the effect of a 500W light. The empirical behaviour of this seems to be as a multiplier. Which one should be used? Or how should I use both to get a "correct" (as in physically correct) result? Also does scale impact the amout of light? I usually set blender to centimeters instead of meters, because I use it with UE4 and UE4 uses centimeters as the unit.Īccording to the documentation the strength value of the node should be in Watts, but this doesn't seem to be correct from experimentation. Is Strength basically just a multiplier? Which means that the light emits 10.000W? The lights weren't very close to the object, but not too far either.ġ000W with 1 in Strength is quite a faint light.ġ0W with 1000 in Strength is very strong instead. I had to increase the Watts to 100000 to get the a good lightning.
I know that the Size option doesn't affect how much light is emitted, but just from where and also the shadow penumbra/softness.īut which value should I use when I set the power of my lights? For example, I have a simple scene with two area lights (30m in size), at the default power they were too weak to light the objects I have placed in the scene (it's a smoke simulation). If you enable "Use Nodes" you also get a generic Strenght value and another (seemingly ignored?) color option. By default there is Power, measured in Watts, and a color option. On Blender 2.80, lights (other than the sun) have various options for their strength.
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