What is OpenGL Default Light Position?

Question

i want to learn about default light positions in opengl.

i have a system setted up like; if there is no light in the scene, system adds a environment light in the scene :

Gl.glEnable(Gl.GL_LIGHT0);
Gl.glLightf(Gl.GL_LIGHT0, Gl.GL_CONSTANT_ATTENUATION, 99999);

if i dont touch the light's Position parameter, light is like an environment light, it doesnt seem like it has a direction, so my objects get light from every angles.. thats kind of cool.. but if i do that:

Gl.glEnable(Gl.GL_LIGHT0);
Gl.glLightf(Gl.GL_LIGHT0, Gl.GL_CONSTANT_ATTENUATION, 99999);
Gl.glLightfv(Gl.GL_LIGHT0, Gl.GL_POSITION, new Vector4(0f, 0f, 1f, 0f).ToArray());

(which is the original value already, because i tested it with Gl.glGetLightfv(Gl.GL_LIGHT0, Gl.GL_POSITION, vec); and it is the same). after i mess with position, it realy becomes like a directional sun light, but i want it to work it like enviroment light. waht am i missing here?