Internal Forum Page

This is a spam free forum – all comments moderated before made public.
This forum is brought to you by Lighting Style – premium supplier of retail and wholesale lights.
What exactly is the...
Clear all

What exactly is the beam angle angle of a flood light?

Trusted Member
Joined: 3 years ago
Posts: 89
Topic starter  

I was wondering, what exactly does the beam angle of a floodlight measure? 

Trusted Member
Joined: 3 years ago
Posts: 98

The beam angle tells you what area in front of the flood light will be illuminated.

The brightness of the flood light is measured in lumens. This is taken at the centre of the flood light's beam where it is brightest, and then you keep on angling out until the brightness is 50% of the centre. You double that angle (because the flood light obviously shines to the left and right of the centre) and that is the beam angle.



Trusted Member
Joined: 3 years ago
Posts: 83

Correct - that is the standard way to calculate it, but it worth noting that the light continues to spread out past the beam angle, into what is known as the beam field, which is the angle until the brightness is 10% of centre brightness.


Leave a reply

Author Name

Author Email

Title *

Preview 0 Revisions Saved