The light is an area light. It affects only lightmaps and lightprobes.

	// Make the light an area light
	light.type = LightType.Area;

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Example() {
        light.type = LightType.Area;
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Example() as void:
		light.type = LightType.Area