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The Fire rollout controls the emissive color (fire) of the volumetric shader, and the light emitted by the VRayVolumeGrid. The color and intensity of the emission can be controlled and gradually transitioned between a physically correct appearance and an artistic appearance. Unlike the smoke color which needs an external light to become visible, fire will be visible immediately.

Unlike the smoke (Diffuse) color, which tells what fraction of the light is reflected by the volume and can't go above 1, the emissive color is an absolute value which can have values larger than 1. There are two parts to it - the color itself and its brightness (luminance). The final color is obtained by multiplying the two. Unlike the smoke color which needs an external light to become visible, fire will be visible immediately if you have set the color. 

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UI Path

 

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||Select V-Ray Volume Grid|| > Modify panel > Rendering rollout > Volumetric Options... button > Volumetric Render Settings window

 

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Fire

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Based on – The source channel that will be rendered as fire. By default the Temperature option is used.

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