Problem with lighting in CG Shader


i wrote a simple shader that compose a texture with a color.
Now i just want to turn off the lighting but it doesn’t work…
Here’s my shader:

Shader "Custom/MyDecalColor" {
Properties {
	_Color ("Main Color", Color) = (1,1,1,1)
	_MainTex ("Base (RGB)", 2D) = "white" {}

SubShader {

	Tags { "RenderType"="Opaque" }
	LOD 250
    Lighting Off

#pragma surface surf Lambert

#include "UnityCG.cginc"

sampler2D _MainTex;
fixed4 _Color;

struct Input {
	float2 uv_MainTex;

void surf (Input IN, inout SurfaceOutput o) {
	fixed4 c = tex2D(_MainTex, IN.uv_MainTex);
	half4 main = tex2D(_MainTex, IN.uv_MainTex);
	c.rgb = lerp (_Color, main.rgb, main.a);
	o.Albedo = c.rgb;
	o.Alpha = c.a;

Fallback "Diffuse"

Can somebody help me?

you can write an empty custom lighting model