A 60W bulb emitting in all directions is about 70 cd, while the same bulb with a reflector is about 4500 cd because the light flux is concentrated into a narrow angle. A 100-Watt (W) incandescent light bulb is approximately 139 candelas (cd). Default=1500.0.Ī single candle is approximately 1 candela (the unit can also be called a "candle"). In some cases, an object might reflect or emit more light than the brightest light object in the scene in this case, use the object's Luminance value as the Physical Scale. This will set the appropriate conversion scale for reflections, self-illumination, and all other non-physically based elements a material offers. Set this value to the equivalent of the brightest light source in the scene. Tip: You need to set the Physical Scale when you use ray-tracing with self illumination. Physical Scale is also factored into reflections, refractions, and self-illumination. For example, with the default Physical Scale of 1500, a standard omni light is treated by the renderer and radiosity as a photometric isotropic light of 1500 candelas. The result is an adjustment of the rendering that approximates the eye's response to the scene.Įach standard light's Multiplier is multiplied by the Physical Scale value to give a light intensity value in candelas. Sets a physical scale for exposure control to use with lights that are not physically based. The exposure value is comparable to the exposure compensation setting in cameras with automatic exposure. Range=–5.0 to 5.0 Negative values make the image darker, and positive values make it brighter. Default=50.Īdjusts the overall brightness of the rendering. Default=50.Īdjusts the contrast of the converted colors. Adjusts the brightness of the converted colors.
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