Make Shadow-Projector a Light-Projector, Shader Noob

Unity Engine
1

Hey Guys.
I have the following shader I’m using for blob shadows. I would like to use another shader (based on the one below) to illuminate instead of darken an area, pretty much like a light. How do I have to change my code?
Thanks

1.Shader "FX/Projector Multiply" { 
Properties {
       _ShadowTex ("Cookie", 2D) = "fresnel.png" {
            TexGen ObjectLinear     
        }
      _FalloffTex ("FallOff", 2D) = "fresnel.png" {
           TexGen ObjectLinear 
       }
   }
   Subshader {
        Pass {
           ZWrite off
           Offset -1, -1
          Fog { Color (1, 1, 1) }
            AlphaTest Greater 0
          ColorMask RGB
           Blend DstColor Zero
           SetTexture [_ShadowTex] {
              combine texture, ONE - texture
              Matrix [_Projector]
           }
          SetTexture [_FalloffTex] {
              constantColor (1,1,1,0)
              combine previous lerp (texture) constant
               Matrix [_ProjectorClip]
          }
      }
    }
}
2

There is an additive projector in the projectors folder. Or am I missing something?

3

Change The Shadows Texture, Or Use The Light Projector Prefab