(Saving Not Supported!) Custom light props in Cities: Skylines

how-to-copy-and-apply-default-lighteffects.cs

// Warning: Lights made with this script can not be saved!

var lightEffect = EffectCollection.FindEffect("Flood Light Orange") as LightEffect;

// Final position in prop
Vector3 pos = new Vector3(0f,10f,0f); 
// this would be in the center of the prop, 10m above ground

// Final direction in prop
Vector3 dir = new Vector3(0f,1f,0f);
// this would be up

var propEffect = new PropInfo.Effect {m_effect = lightEffect, m_position = pos, m_direction = dir };

(GameObject.Find("Tool Controller").GetComponent<ToolController>().m_editPrefabInfo as PropInfo).m_effects = new PropInfo.Effect[] { propEffect};
(GameObject.Find("Tool Controller").GetComponent<ToolController>().m_editPrefabInfo as PropInfo).m_hasEffects = true;

how-to-create-a-completely-custom-light-effect.cs

// Warning: Lights made with this script can not be saved!

var existingLightEffect = EffectCollection.FindEffect("Flood Light Orange") as LightEffect;
LightEffect newLightEffect = LightEffect.Instantiate(existingLightEffect);
newLightEffect.transform.parent =  existingLightEffect.transform.parent;
Light light = newLightEffect.gameObject.GetComponent<Light>();

// ----------------
// start of options

// create blinking lights
// Possible values: None,	Blink_050_050, MildFade_0125_0125, MediumFade_500_500
newLightEffect.m_blinkType = LightEffect.BlinkType.MildFade_0125_0125;

// light color
// (r, g, b, a)
light.color = new Color(0.0f, 1.0f, 1.0f, 1.0f); 
// this would be 0% red, 100% green, 100% blue

// light type
// Possible values: Spot, Directional, Point, Area
light.type = LightType.Spot;

// more options 
light.range = 70;
light.spotAngle = 35;
light.intensity = 8;
newLightEffect.m_spotLeaking = 0.5f;
newLightEffect.m_fadeStartDistance = 250;
newLightEffect.m_fadeEndDistance = 400;
newLightEffect.m_fadeSpeed = 10;

// Final position in prop
Vector3 pos = new Vector3(0f,10f,0f); 
// this would be in the center of the prop, 10m above ground

// Final direction in prop
Vector3 dir = new Vector3(0f,1f,0f);
// this would be up

// end of options
// --------------

newLightEffect.m_batchedLight = true;
typeof(EffectInfo).GetField("m_refCount", BindingFlags.Instance | BindingFlags.NonPublic).SetValue(newLightEffect, 0);

newLightEffect.InitializeEffect();

var propEffect = new PropInfo.Effect {m_effect = newLightEffect, m_position = pos, m_direction = dir };

(GameObject.Find("Tool Controller").GetComponent<ToolController>().m_editPrefabInfo as PropInfo).m_effects = new PropInfo.Effect[] { propEffect};
(GameObject.Find("Tool Controller").GetComponent<ToolController>().m_editPrefabInfo as PropInfo).m_hasEffects = true;