Add a vertical profile of the strip light on the desired wall, using tiling and cutting tool. Select Apply to save changes.

In the mid-state, select the newly created profile, and under the material tab in the left hand panel, assign it an emissive material.

If not already there, clone the current material by selecting the clone icon against the dropdown and assign it an emissivity of 0.5-1.

Select Apply to save changes, and go Back to Designing.