Tip #3: Calculating Lumens in a Far-Field Intensity Distribution

Often, an illumination system is required to meet a specific far-field intensity distribution. The engineer needs to know how many lumens are required to produce this pattern in order to determine if the proposed design approach is feasible. You can use ASAP® to determine the lumens using the following method:

Create a text file that defines the intensity distribution for use with the USERAPOD ANGLES command. In ASAP, create a point source that is apodized by the file created. Multiply the lumens by 4*PI.

A STATS command will then give the total lumens in the pattern. You can also generate an Iso-Candela plot to verify that the far-field distribution is correct.

The files listed below under "Related Files" demonstrate this example.

Note: If you make changes to the text file used for apodization, ASAP cannot pick up the change since the apodization data is stored in memory. By creating a copy of the text file and loading this dummy file first, it forces ASAP to read from the file.

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