I am planning to build an electronic fencing scoring apparatus for training purposes in our club (so no FIE certification required, it's a pure hobby project).
For hit indication, I want to use a bunch of colored LEDs in a grid (probably 9-25). However, I have no idea how bright those LEDs need to be. Being for fencing, I have the following use case:
- Well lit indoor environment (a gym hall)
- distance of 5-10m
- wide viewing angle (routinely viewed from ~60°)
- colors are red, green and white
Are there guidelines or a rule of thumb for the luminous intensity I should use?
Does the necessary luminous intensity change when using multiple LEDs in a grid, or can I just add up the intensities of all LEDs?
As this is the first project where I use LEDs for more than just small status indicators that don't have to be visible from far away, I'm a bit clueless. Even an order of magnitude estimate would be a help.