You should use "LIGHT_PARAM full_custom_halo_night" instead. You can customise the colour, shape and direction of the light beam exactly like with LIGHT_SPILL_CUSTOM. Use LIGHT_PARAM full_custom_halo for lights that are on all the time. It does not check for a dataref so it will also be a bit faster. LIGHT_PARAM full_custom_halo X Y Z A S Dx Dy Dz W X,Y, Z Position relative to the center of the object A Master dimer or brightness S Size Dx, Dy, Dz Direction in which the light shines W Width (Cos(angle), I am not sure if you can use 1 for omnidirectional lights)