This screen prompts for the photometric distribution Type (Type B or Type C) and the correlated vertical and horizontal angles.

Photometric Type

Photometric Toolbox allows for the specification of two IESNA photometric Types; Type B and Type C. Type B photometry is used to represent floodlight distributions and Type C photometry is used to describe Roadway and Interior distributions.

Photometric Toolbox does not support type A photometry. Don't be confused: what has for many years been referred to as type A in the USA is really type C!

If unsure of the photometric type, use these hints to identify the distribution type:

- Negative horizontal or vertical angles- Type B
- Floodlight luminaire- often Type B but not always
- Vertical angles above 90 degrees - Type C
- Horizontal angles greater than 90 degrees- Type C

Number of Vertical Angles

Select an appropriate angle set for the vertical angles from the pull- down menu or type in a number manually. A complete list of vertical angles is displayed below. The individual vertical angles may be replaced by alternate values, if needed.

Number of Horizontal Angles

Select an appropriate angle set for the horizontal angles from the pull- down menu or type in a number manually. A complete list of horizontal angles is displayed below. The individual horizontal angles may be replaced by alternate values, if needed.