Blender Internal renderer question How do I enable, for example, additive blending for a material? Do I need to use node? I am trying out to create a light ball.

I searched the internet but only found answers for cycles.

Edit:
The result should be like the first picture in this topic: How to get additive blending in cycles?
Using nodes would be only way to make additive blending for material.
Though If You're making a light ball in Blender Internal You don't need it. Just go to material, find Shading make Emit higher then 1, go to World, check Indirect Lighting switch Gather(right below Indirect Lighting) to Approximate and voila, You got ball, that emits light.