How do I fix this?

How do I make the lighting not pass through the parts?

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Aside from switching to future theres not much you can do, You could set the light range to be smaller but theres not really a way to have proper shadows in roblox

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Like @budmomo said, there’s not much you can really do besides changing the lighting to Future or reducing the range/brightness. Increasing the thickness of the parts or checking CastShadow might help.

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Suggestion I have, make loads of separate lights, that have a small light, distance. and bunch them up until you have a perfect lighting, another way is making a neon yellow block about the transparency of 0.8 and that should make it look like there is light.