Light Throw Distance Calculator

In this video learn how to calculate the beam distance of a flashlight.

Light throw distance calculator. Find your screen size and throw distance with the projection calculator classic by following these 2 easy steps. The calculation result is from the lens center of projector. Use this calculator to determine either the size of the circle of light how far away you should place the light or which degree of lens you should use. Put in two of the values and then hit calculate to find the third value.

For instance if you wish to know the coverage area spot size of a 10 beam mounted 25 feet off of the deck throw distance just enter these two values and click the calculate spot size to find the diameter of the spot. Using a digital light meter digital lux meter or lux meter app light meter app on your phone. First of all divide your set into overlapping acting areas. Lens layout varies dependent on projector.

Essentially as light travels from the emitter it will disperse throughout an area. Measureing lux flashlight beam distance throw range yards meters. The calculator helps you to calculate the exact beam angle. For any given projector the width of the image w relative to the throw distance d is know as the throw ratio d w or distance over width.

So for example the most common projector throw ratio is 2 0. Multiplying factor x throw distance diameter of area covered mf x t d. Typically the more lumens a light fixture provides the brighter it is. Don t try a 3ft image size with a 5m throw distance the answer will be wrong.

The scale of projector is not accurate. This means that for each foot of image width the projector needs to be 2 feet away or d w 2 1 2 0. Values can be in feet or meters but both values must match. One lux is equal to one lumen per square meter lux lumens m 2.

Finding the true range distance capability of your long range flashlights. 1 metre 3 2808399 feet. Then try and figure how far away from the actor the light needs to be throw distance to create a pool of light that is 8 10 feet in diameter at head height we light faces not feet. Here you can calculate the direct relationship between the beam angle diameter of the light circle and the distance to the illuminated object floor table work surface wall picture.

5 for all values except projector output and screen luminance. This little calculator will work for all lantern manufactures whether it be selecon pacific an etc source 4 profile an robert juliat followspot robe moving light its only trigonometry. Use the multiplying factor.