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Maxwell Render 2.5 User Manual

Chapter 6. Lighting with Emitters | 23

Emitter Materials are dened in a very intuitive way, using real world values like watts or

efcacy. Your emitter can be dened in three different ways:

• Custom: This option allows you to set the Color and the Intensity of your light

separately. Color can be set in RBG, HSV or XYZ scales, or correlated to a Kelvin value.

Intensity (or Luminance) can be set in a number of different ways (see next section).

You can also specify an IES/ Eulumdat le to light your scene, using measured lighting

data for different lighting xtures. These les are provided by many major lighting

manufacturers.

• Temperature: In Kelvin degrees. In the real world, the temperature of the light

source determines both the color and its intensity. Colder temperatures (near 3000ºK)

emit reddish, low-intensity light, while higher temperatures (near 9000ºK) emit blue,

bright light. This control will allow you to adjust both the intensity and the color of

your emitter with one single slider.

• HDR Image: You can use a high dynamic range image which will emit light from the

emitter surface, using images in HDR, EXR or MXI formats.

6.01 Custom

F.01 Custom

• Color: This parameter refers to the color of the light emitted. There are two ways to

specify the color:

a. Using the Color Picker: Clicking on the colored square allows the user to

choose a color in the Maxwell Render color picker.

b. Correlated Color at Kelvin Temperature (ºK): This options lets you choose

the color that would correspond to an emission in Kelvin degrees. Please note

that choosing this option will not make any changes in intensity, just color. Low

Kelvin temperatures are reddish, 6500ºK is considered white, and higher values

will produce a bluish light.

• Luminance: Species the intensity of the light. There are several options to specify

luminance, like Power & Efcacy, Lumens, Lux, Candelas and Luminance:

F. 01 Luminance types

a. Power and Efcacy: These options allow you to specify how much electricity

a light source consumes (Watts) and how efciently it converts that electricity

into visible light (Efcacy). The efcacy number species how many lumens are

emitted per watt. For example, a common 40W incandescent light bulb will have

a rather low efcacy of 12.6 lumens/ watt. This information is usually supplied

by the bulb manufacturers. A more efcient, energy saving bulb which is also

rated at 40W will have an efcacy of perhaps 17.3 lumens/ watt, so for the same

amount of energy consumed, it will emit more light. The watts/ efcacy way of

specifying an emitter’s intensity is useful if you would like to mimic common light

sources, where the manufacturer provides the watt rating and the efcacy rating.

In the “Output” row you can see how many Lumens a particular watt/ efcacy

setting will create.

b. Luminous power: Lumens (lm) is the SI (International System of Units) unit

for luminous ux. It is a common way to specify how much light is emitted. Light

manufacturers usually supply this data.

c. Illuminance: Lux (lum/m^2). Lux is the unit for specifying illuminance. It is

dened as one lumen per square meter. This is a useful setting when you would

like to increase or decrease the size of your emitter, and have it emit more or less

light. If you use lumens and scale up your emitter, the same amount of lumens

are emitted but from a larger area, giving the impression that the emitter is

weaker. If you use Lux however, the amount of lumens increases/ decreases with

the scale of your emitting surface.

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