Adding commas into Text layers

//Create a new Slider Expression effect. I named it 'Score'

var num = effect("Score")("Slider");
num = Comma(num);
[num]

 function Comma(number)
    {
    number = '' + Math.round(number);
    if (number.length > 3)
       {
       var mod = number.length % 3;
       var output = (mod > 0 ? (number.substring(0,mod)) : '');
       for (i=0 ; i < Math.floor(number.length / 3); i++)
           {
           if ((mod == 0) && (i == 0))
                output += number.substring(mod+ 3 * i, mod + 3 * i + 3);
           else
                output+= ',' + number.substring(mod + 3 * i, mod + 3 * i + 3);
           }
       return (output);
       }
    else return number;
    }

Limiting Decimal Places In Text Layers

Adding .toFixed(4) after the variable limits the decimal places to 4.  ie 26.7835
Adding .toFixed(2) would limit the decimal places to 2.  ie 26.78
.toFixed(3) would limit the decimal places to 3.  ie 26.784  (note it rounds value)


ex:  avgEQ = (thisComp.layer("1").transform.scale[1] + thisComp.layer("2").transform.scale[1])/2;
       avgEQ.toFixed(4)

Aligning Lens Flare To Target

In order to align the streak of the lens flare to a target, first create 2 nulls (LightTarget, LightSource)

Light Factory Location =
lSource = thisComp.layer("LightSource").transform.position;
lTarget = thisComp.layer("LightTarget").transform.position;
Anchor = transform.anchorPoint;
lSource-lTarget+Anchor

Light Factory's layer position =
thisComp.layer("LightTarget").transform.position

Make sure the solid layer that the lens flare is applied to is large enough for the comp.