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Maxwell Render 2.5 User Manual

Chapter 6. Lighting with Emitters | 24

d. Luminous Intensity: Candela (cd). Candela is considered the SI unit for

luminous intensity; the power of the light emitted in a certain direction.

e. Luminance: Nit (cd/m^2). One “Nit” is one candela per square meter.

F.01 Power and efcacy F.02 Luminous power F.03 Illuminance

F.04 Luminous intensity F.05 Luminance

• Preset: Maxwell Render™ provides some emitter presets of standard type light

sources. Please note these presets will change the color as well as the intensity of

your emitters.

F.06 Presets

• IES/EULUMDAT: Lets you load an .IES or .EULUMDAT le that species the intensity

and direction of emission of a certain light xture. This is very useful if you want to

use a certain light xture from a manufacturer that also provides this information

for it, but you don’t want to actually model the xture itself. The lighting pattern

and intensity of the emitter will look correct, just as if you had actually modeled

the xture. You can use IES/EULUMDAT emitters with any type of geometry but

for the most predictable results it is recommended you apply it on a small sphere.

Please note that you cannot change the intensity of the emitter in this case since this

information is provided from the .IES/.EULUMDAT le itself, but you can still change

the color of the emitter.

F.01 IES

The Maxwell installation comes with a large collection of IES and Eulumdat les, and you

can easily get more from lighting manufacturers or on the internet.

Important note: IES and Eulumdat les are commonly used to mimic lighting xtures,

using the lighting information les provided by manufacturers. They are handy because they

can easily imitate the complex lighting effects produced by certain specic xtures, without

having to model the lamp itself. However, they must be used with care because they can

sometimes produce physically incorrect results.

Both formats contain the luminous intensity at any angle, measured in laboratory using light

sensors located all over a spherical dome around the light source, pointing to the center of

the dome so that the data capture method considers all lamps as point sources. This means

that with these formats, the physical correctness of the result is highly dependent on the

geometry you apply the IES/ Eulumdat les to.

To get the most physically correct results, IES/ Eulumdat les should be applied to small

spheres to copy the laboratory environment they were measured in as much as possible.

Applying an IES or Eulumdat le to a geometry other than a small sphere or using les

captured from a non-point lamp can cause inaccuracies inherent to the method and format

denition.

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Arrow Group Industries LM86 Manual do Utilizador Página 24