Homebrew PCBs

javaguy11111 wrote:
> 
> 
> The half angle is 10 degrees which is the half power point according
> to the data sheet from Best Hong Kong. So if I want the two LEDs half
> power point to fall halfway between them, that would be .25 inches. A
> little trig gives me that the LEDs should be 1.4 inches above the board.
> 
> So I am pretty close to what a calculation will show. Of course 1.25
> was just a guess, not a calculation.

Have you tried chopping off the tops of the LEDs with a Dremel? That 
should give significantly broader coverage, no longer constrained to the 
10 degree lens. I do this when making arrays of LEDs for illumination.

You can test the coverage using a luminescent (day-glow) material. The 
average intensity will be lower, but more even.

BB