LibGDX box2dlights disable lighting for specific body defs?

Newbie & Debugging Questions
#1

Hello I have a BodyDef I created, named grass (used own class to design it nicely)


		FixtureDef def = this.bodyBuilder.buildSqaured(new Vector2(45 / 2, 45 / 2), 1f, 1f, 1f);
		this.entityCollection.addStaticBody("grass", def);

Now, grass should not have any shadows at all, it’s just grass.
How can I disable lights for certain Fixtures?

When I render I get this:

Also my grass is green, I dont know why it turned purple.

Is there a way to disable lighting for certain fixtures?