Weblight

Specify source position

Specifies the location of the light in 3D space:

• Pick a point in the drawing to position of the light
• Enter x,y,z coordinates
• Press Enter to accept the default location

Specify target position 

 Specifies the location of the target, the point at which the light is focused:

• Pick a point in the drawing to position of the target
• Enter x,y,z coordinates
• Press Enter to accept the default location

Name

Specifies a name for the light; prompts you:

Enter light name <Weblight1> - (enter a name or press Enter to accept the default name.)

Intensity Factor

Specifies the intensity of the light; prompts you:

Enter intensity (0.00 - max float) <1.0> - (enter an option:)

• Enter an intensity values between 0.00 and the maximum value supported by your system (max float = maximum value of a floating point number)
• Press Enter to accept the default value

Status

Toggles the use of this light; prompts you:

Enter status [ON/OFf] <ON> - (enter an option:)

• ON - light is included when calculating renderings
• OFf - light is excluded

Photometry

Specifies the photometric properties of the light; prompts you:

Enter a photometric option to change [Intensity/Color/eXit] <Intensity> - (enter an option:)

• Enter intensity (Cd) or enter an option [Flux/Illuminance] <1500.0>: - (enter the intensity expressed in candela or an option:)
  Enter Flux (Lm) - (enter the luminous flux expressed in lumens.)
  Enter Illuminance (Lx or Fc) or enter an option [Distance] <9424.8> - (enter the illuminance expressed in lux or foot-candles.)
  Enter Distance - (Enter a distance expressed in drawing units.)

• Enter color name or enter an option [?/Kelvin] <D65> - (enter a color name.)
  ? - lists the names of available colors, such as:

      D65
      Fluorescent
      Coolwhite
      Whitefluorescent
      daylightfluorescenT
      Incandescent
      Xenon
      Halogen
      Quartz
      Metalhalide
      mErcury
      Phosphormercury
      highpressureSodium
      Lowpressuresodium

Enter Kelvin temperature <3600.0> - (enter a color temperature expressed in degrees Kelvin.)

Web

Specifies the light distribution map, called a "web" as an uneven light distribution can look vaguely like a spider's web:

Prompts you:

Enter a Web options to change: File/X/Y/Z/<Exit> - (enter an option:)

• Enter Web file - (enter the name of an IES file, which is a text file that describes the intensity of a light source at many points on a spherical grid (image credit Vertheim).)
• Enter Web X rotation in degrees <0.0000> - (define the X rotation for the web.)
• Enter Web Y rotation in degrees <0.0000> - (define the Y rotation for the web.)
• Enter Web Z rotation in degrees <0.0000> - (define the Z rotation for the web.)

Shadow

Specifies the look of shadows cast by this light; prompts you:

Enter shadow settings [Off/Sharp/soFt mapped/soft sAmpled] <Sharp> - (enter an option:)

• Off - disables the calculation of shadows for the light.
• Sharp - displays shadows with sharp edges. Use this option to increase performance.
• Soft mapped - displays realistic shadows with soft edges.
  Prompts you: Enter map size [64/128/256/512/1024/2048/4096] <256>:
• Soft sampled : Displays realistic shadows with softer shadows based on extended light sources; prompts you:
  Enter an option to change Shape/sAmples/Visible/<eXit> - (enter an option:)
      Enter shape [Disk/Rect] <Disk> - (type D or R.)
      Enter radius <0.0> - (enter the radius of the disk.)
      Enter Width <0.0> - (enter width of the rectangle.)
      Enter Length <0.0> - (enter length of the rectangle.)
• Enter Shadow Sample <16> - (specify the sampling size of the shadow; larger numbers are more accurate but take longer to render.)
• Enter Shape Visibility [Yes/No] <No> - (type Y or N to cast a shadow that represents shapes (more accurate) or is rectangular (faster to render).)

Filter Color

Specifies the color of the light; prompts you:

Enter true color (R,G,B) or enter an option [Index color/Hsl]:<255,255,255> - (enter an option:)

• Enter true color - the RGB color model is an additive color model in which red, green, and blue light are added together in various ways to reproduce a broad array of colors. The name of the model comes from the initials of the three additive primary colors, red, green, and blue. The component values are stored as integer numbers in the range 0 to 255, the range that a single 8-bit byte can offer (by encoding 256 distinct values).
• Index color - specifies an AutoCAD Color Index color.
• Hsl - specifies the color using three parameters Hue, Saturation and Lightness

Exit

Concludes the command and creates the light.