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I want to turn off a bunch of lights inside a collection using falloff in animation nodes but i cant find a node that connects the value of the light intensity to the falloff or a node that allows me to apply the falloff to all lights in the collection.

Thanks in advance for the help! :)

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2 Answers 2

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You need to know how to access and modify each light's energy. Then evaluate the falloff in a subprogram and tweak each light's energy.

In order to know the property's name, you have to activate "Python tooltips" in the preferences :

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Then hover you cursor over the field :

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So, given the point light, you access its energy with an attribute node and the path data.energy. Similarly, if you want to access the color, you would use data.color.

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For ease of use put all your lights in their own collection.

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Add your falloff object (I chose a cube), tweak the fallof type and connect it to your subprogram.

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Result :

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    $\begingroup$ Just like last time you come here and save my day! Thank you! <3 $\endgroup$
    – TECHGUNK
    Commented Sep 3, 2020 at 12:33
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    $\begingroup$ Always a pleasure to answer clear and precise questions :) $\endgroup$
    – Gorgious
    Commented Sep 3, 2020 at 13:36
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We can also do this directly without using loop:

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