Illumination

Point Lights

  • Radius :

    • Soft Shadows.

Spot Light

  • Radius :

    • Soft Shadows.

  • Spot size :

    • Width of the cone.

  • Blend :

    • Soften cone edges.

Sun Light

  • Angle :

    • Soft Shadows.

    • "Atmospheric diffusion".

Area Light

  • Spread :

    • How focused the diffuse light is.

IES Textures

  • Considered Photometric Lights.

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Emission

  • Make sure the Emission Strength is greater than zero.

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  • Bloom :

    • Enable Compositor  in Viewport Shading.

    • .

    • Enable nodes in Compositor .

    • .

    • Add a Glare Node with Bloom.

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