Copyright Goodheart-Willcox Co., Inc. 498 AutoCAD and Its Applications—Advanced palette, which allows you to change all of their settings at the same time. This is an excellent way to make the lighting in your scene uniform or to control a series of lights with a single edit. A light can be deleted from the scene using the Lights in Model palette. To do so, simply right-click on the name of the light and select Delete Light from the shortcut menu. The light is removed from the drawing. Using the UNDO command restores the light. If a single light is selected, the right-click menu also contains an option to control the display of the glyph for the selected light. The options are Auto, On, or Off. Properties Palette The Photometric properties subcategory of the General category in the Properties palette has special settings for photometric lights. The Lamp intensity property deter- mines the brightness of the light. The value may be expressed in candelas (cd), lumens (lm), or illuminance (lux) values. When you select the Lamp intensity property, a button is displayed to the right of the value. Picking this button opens the Lamp Intensity dialog box, Figure 18-18. In this dialog box, you can change the illumination units and set the intensity (Lamp intensity property). You can also set an intensity scale factor. This is multiplied by the Lamp intensity property to obtain the actual illumina- tion supplied by the light. The read-only Resulting intensity property in the Properties palette displays the result. The Lamp color property in the Photometric properties subcategory controls the color of the light. If you select the property, a button is displayed to the right of the value. Picking this button opens the Lamp Color dialog box. See Figure 18-19. This dialog box gives you the option to control the color of the light by either standard spectra colors or Kelvin colors. The color selected in the Filter color: drop-down list is Select a unit type Enter a value Enter a scale factor Figure 18-18. The Lamp Intensity dialog box is used to set the intensity for a light. Select a color type and enter a value Light color Select a filter color Color cast by the light Figure 18-19. The Lamp Color dialog box is used to set the color for the light and a filter color, if needed.