The tab defines the emitting component of the material.
Emission
Specifies the brightness of the emission as the product of weight and density.
Color
Sets the emission color.
Kelvin
Emission temperature in Kelvin. The correct formula for the blackbody spectrum is used.
Spectral intensity
Additional adjustment of the intensity along the spectrum using a spline.
Visible to camera
The option makes the emitting geometry visible to the camera (for primary beams from the camera). For secondary beams, the emitting sources are always visible.
Optimize sampling
If a texture map is used to specify color or intensity, then this option creates an optimizing structure for sampling. If there is a lot of emissive geometry in the scene (optimization is performed out for each triangle separately), then the scene preparation time may be unreasonably long. In this case, it is better not to create this structure.
Two-sided
Light will go in both directions from the emissive surface.
Lambertian
The option enables compliance with physics when calculating radiation (depending on the angle to the surface).
