Smart UVC Troffer - In Stock, Ready to Ship

Cart 0

Footlamberts: What and Why?

Posted by on for ProLampSales

A footlambert (or foot-lambert) is a unit of luminance. It is used primarily in the projection industry to provide a value for luminance of images on a projection screen.

1 footlambert (fL) is equal to 3.43 candela per square meter (cd/m2).

When the footlambert value is known for a projection system (the projector and a screen), assumptions can be made about the clarity of images when viewed with varying ambient light levels in a room.

To calculate the footlamberts on a screen you need the following units:

  • Projector Lumens
  • Screen Gain
  • Screen Width
  • Screen Height

Use online calculators to get the footlambert total for your system and the recommended range for acceptable ambient light. Here are two web sites with calculators: (scroll down this page to find the footlambert calculator)

Featured Products (View All)

Share this post

← Older Post Newer Post →

Leave a comment

Please note, comments must be approved before they are published.