lightCALC advanced – Step 2 – Geometry

This section is easy.  Describe the space by length, width and height.  Then tell the program where you want to measure the light by adjusting the workplace height.  If you want to measure the light at floor level, set the work plane height at 0.  If you want to measure at 5 feet, insert a 5 in this space.  This height is always expressed in feet, so if you wish to measure light 30 inches above the floor, insert a value of 2.5 to indicate two and one-half feet.

Adjusting the suspension length allows you to drop fixtures below the ceiling line.  For recessed luminaires, set this value at 0.  For others, express the distance in feet from the ceiling.

As you adjust these dimensional variables, you will see the Room Cavity Ratio (RCR) value change.  This has a direct bearing on the calculations, but cannot be manually adjusted.

Please note the change in the graphics as you add this data.  Remember that you can change the graphic depiction using the “View” toolbar at the top of the display.