Can I disable lighting for efficiency?

I assume that calculating the lighting in a scene is taking up cpu/gpu resources. I'm creating an IOS game and I want to be as efficient as possible.

I might be misunderstanding how it all works (I'm new to this) but I want to disable lighting and give my 3D objects textures that mimic lighting. I don't need realitime shading calculations.

Can I disable all lighting and shading and just have everything rendered at a specific intensity?

Thanks Gareth