The Texture emission allows any valid Texture node to set the light intensity. You can use this to create interesting effects, such as TV screens, by using an Image texture as the source (figure 1).
Figure 1: An imported texture map used as a texture emission source.
Texture
Sets the light source's efficiency. You can set this to a value or texture. Keep in mind that real-world lights aren't 100% efficient at delivering power at their specified wattage - a 100-watt light bulb doesn't deliver 100 watts of light. This parameter enters the real-world values.
Power
The light source's wattage. You should set each light to their real-world wattage - for example, set a desk lamp to 25 watts, a ceiling lamp to 100 watts, and an LED light to 0.25 watts.
Surface Brightness
Causes emitters to keep a constant Surface Brightness, independent of the emitter surface area.
Keep Instance Power
Enabling this option with Surface Brightness disabled and Uniform Scaling applied to the object causes Power to remain constant.
Double Sided
Allows emitters to emit light from the front and back sides.
Distribution
Controls the light pattern. You can set this to a Greyscale or RGB image so that you can load an Image texture or IESAn IES light is the lighting information representing the real-world lighting values for specific light fixtures. For more information, visit http://www.ies.org/lighting/. file. the Image texture's Projection nodes adjust the light's orientation and direction.
Choose what light sources receive more samples.
Light Pass ID
The Light Pass ID captures the respective emitter's contribution.
Enables light source visibility on diffuse surfaces. It enables Black BodyAn opaque object that emits thermal radiation. In Octane, this is used to designate illumination properties for mesh emitters. or Texture emission light sources to cast illumination or shadows on diffuse objects. Disabling this option disables emission - it's invisible in diffuse reflections, but is still visible on specular reflections. It's also excluded from the Direct light calculation. This option is enabled by default.
Enables the light source's visibility on specular surfaces, and hides emitters on specular reflections/refractions. This is enabled by default.
Transparent Emission
Light sources cast illuminations on diffuse objects, even if the light source is on transparent material.
Cast Shadows
Enables light sources to cast light and shadows on diffuse surfaces, letting you disable direct light shadows for Mesh emitters. To make this option work, the Direct light calculation must include the emitter (the sampling rate must be greater than 0). This option is enabled by default.