I want to select LEDs for a specific application. My requirement is as stated -
- I have a beacon. this should be visible to a person at a distance of say 50feet.
- Smallest form factor as weight is a criteria.
- Visibility is the only criteria. I am not trying to illuminate a surface.
I want to know how can I go about selecting the LEDs for this particular application ? I understand that Lumens is the unit. Say, I select an LED of 500Lumens, how can I calculate the distance at which its visible ? Also, if it is visible, is it enough to be perceived as a legitimate source ? Probably this might require some field tests.
Also, are LED lumens additive ? Say, my requirement is 2000lumens, can I use 4 LEDs of 500LUmens to get the same effect ?