The demo runway lighting is made as one single model. All the lights are small polygons with a mapped texture. It uses the “Mip-Map” technique to have the lights grow with increasing distance.
Of course it would be possible to create runway lighting with individual effects attached to each light, but I can tell you that this will heavily impact rendering performance!
That’s why today, airport developers tend to use the mip-map technique to have performance friendly *custom* runway lighting.
As Jorge mentioned, since these are all basic modelling techniques and not really SODE related, it is better to ask in a modelling forum, like fsdeveloper.com for guidance on how to create FSX models and all the techniques required to get runway lights with the mip-map technique.
Best regards