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Start from a preset, click the scene, then adjust the light in Structure details. Lights need the structure to have its own geometry; see Geometry.

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Place a light

1

Pick a preset

Click Light in the left dock or press 8. In the top bar, open Preset and choose Bulb, Ceiling spot, or Neon.
Top bar with the Preset list open and the Light tool active in the dock

Preset list open with Bulb, Ceiling spot, and Neon.

2

Click the scene

A crosshair labeled with the preset and the position follows the pointer. One click places one light, selects it, and returns to Select. A Ceiling spot aims along the face under the pointer.
Spot light selected in the scene with cone lines and the Light section on the right

A spot light after placing, with its handles and the Light section.

Pointer in the transform bar decides what the pointer can land on while you place.

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Tune a light

Select a light in the scene or under the Lights filter in the tree. Its sections, from the top:
Light section list with type, color, range, cone warning, volumetric, corona, shadow, and schedule

The light's sections for a spot with an invalid cone, and the 24-hour schedule.

The last five rows sit in the Advanced section.

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Light shafts

Turn on Volumetric > Active for a visible beam. Volume intensity, Volume scale, Outer color, Outer intensity, Outer exponent, and Volume distance stay disabled until it is on. In the editor the beam is a translucent shape, so the preview is approximate.

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Handles in the scene

A selected spot shows Light range, Light inner cone, and Light outer cone handles; a capsule shows Capsule length. Drag one to change the value. Hold Ctrl to skip snap.

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Limits

The Checker warns when an interior has too many lights, because the preview shares its light budget with the world, and blocks export above the hard limit. Delete lights or merge them into fewer, stronger ones.

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Troubleshooting

In Cone, lower Inner or raise Outer until the inner angle is not larger.
This blocks export. Set Range (m) above 0.
This blocks export. Set Intensity to 0 or more.
The room was deleted. Set Room to Auto.
This blocks export. Add geometry to the structure first.
Enter a whole number from 0 to 255 in the field you edited.
Give Normal a direction on at least one axis, or turn Clip plane off.