I want to design tail-lights for onboard use in vehicles (mostly bicycles), but I wonder how should I configure the system so as to get the best visual perception from a distance.
Each lighting element of the system would be composed of a number of LEDs, and the design parameters would be:
- Number of LEDs;
- Brightness of each individual LED;
- How far the LEDs are from each other (or alternatively, the area "covered" by each led array);
So if I had 3 Watts available, I wonder if it would be best to use a single, point-like high power led, versus using 3 x 1 W LED, and in the later case if they sould be as close as possible or a bit far from each other, or even yet to use a wider area with, say, ten or twelve 5mm "bright" leds similar to those used in traffic signs.
Is there well-established way to anticipate how perceptually bright any light source would be, as seen from a distance, regarding those three parameters in the context of LED lights?