UBOs.py

class Light:
    def __init__(self):
        self.pos = ParamVector3f(0)
        self.color = ParamVector3f(1,1,0)
        self.mvp = ParamMatrix4f(0)

        self.struct = StructParameter()

array = ArrayParameter()
array.append(lights[0].struct)
array.append(lights[1].struct)

node.setShaderInput("lights", array) 

Shader:

struct Light {
    vec3 pos;
    vec3 color;
    mat4 mvp; 
    ...
};
Lights lights[1024];