Thanks for the tip, I bought my light gun from there but the super ir led bar is no longer available.
I think Ill make my own ir led bar
I did some calculations here.
http://ostermiller.org/calc/triangle.htmlI set bottom right angle to 60 degrees.
I set bottom side to half of screen width.
Left side is distance from gun to screen.
According to the manuals, the gun angle (top angle) should be 17 degrees or less for optimal performance.
The gun has 60 degrees sensor width but it needs to see all ir leds and the ir leds are not placed in the center of the screen, thats why the gun can not point 30 degrees to each side.
This means you have 17*2= ~34 degrees of movement freedom of the gun.
In my case, 2 metre wide screen = 3.4metre distance required...
I shall try with a TV tomorrow, its only 104cm wide so a distance of 180cm should be enough.
Seems convincing enough, but I do not understand why custom built ir sensor bars with more distance between leds supposedly work better with big screens. When the sensor bar is made larger the gun cant move as freely to the sides because it still needs to see the led on the other side of the screen.
Wider distance between ir leds would increase resolution and make the sensor more precise, but also increase the minimum required distance.
If my theory is correct, would be great if someone could clarify :-)