On – Turns the VRayLight on and off. Type – Specifies the shape and function of the light: Plane – The VRayLight takes the shape of a planar rectangle. See the Plane, Disc, Sphere Light page. Sphere – The VRayLight has the shape of a sphere. See the Plane, Disc, Sphere Light page. Dome – The VRayLight emanates from a spherical or hemispherical dome around the scene extents. See the Dome Light page. Mesh – Allows the usage of any mesh object as the shape of the light. This page describes the parameters and usage for this type of light. Disc – The VRayLight takes the shape of a planar disc. See the Plane, Disc, Sphere Light page. Targeted – When enabled, a separate target object is attached to the light source. This option does not change the lighting behavior of the Mesh light. This option can be changed only on the Modify panel. Units – Specifies the light units. Using correct units is essential when you work with the VRayPhysicalCamera. The light automatically takes the scene's unit scale into consideration to produce the correct result for the scale you are working with. The possible values are: Default (image) – The color and multiplier directly determine the visible color of the light without any conversion. The light surface appears with the given color in the final image when seen directly by the camera (assuming there is no color mapping involved). Luminous power (lm) – Total emitted visible light power measured in lumens. When this setting is used, the intensity of the light does not depend on its size. A typical 100W incandescent light bulb emits about 1500 lms of light. Luminance (lm/m²/sr) – Visible light surface power measured in lumens per square meter per steradian. When this setting is used, the intensity of the light depends on its size. Radiant power (W) – Total emitted visible light power measured in watts. When using this setting, the intensity of the light does not depend on its size. Keep in mind that this is not the same as the electric power consumed by a light bulb for example. A typical 100W light bulb only emits between 2 and 3 watts as visible light. Radiance (W/m²/sr) – Visible light surface power measured in watts per square meter per steradian. When this setting is used, the intensity of the light depends on its size. Multiplier – Multiplier for the light color, and also the light intensity for some Units settings. Mode – Specifies the mode in which the color of the light is determined: Color – When selected, the Color swatch specifies the color of the light rays and of the light source itself when visible in renderings. For Units settings other than Default (image), this color is normalized so that only the color hue is used. Temperature – When selected, the color of both light rays and the light source itself is specified by the Temperature value expressed in Kelvin. Map – Enables the use of a texture for the light surface. The button under this option selects the map to use. The texture intensity is also affected by the Multiplier value. This parameter is not supported when working with the V-Ray GPU render. |